Indenture of Trust

Exhibit 10.12

August 19, 2004

IRREVOCABLE LETTER OF CREDIT NUMBER SB/IRB 314

     Wells Fargo Bank, National Association, as Trustee (the “Trustee”) under the Indenture of Trust, dated as of August 1, 2004 (the “Indenture”) between the City of Chaska, Minnesota (the “Issuer”), and the Trustee, pursuant to which $5,630,000.00 in aggregate principal amount of the Issuer’s Variable Rate Demand Purchase Revenue Bonds (Lifecore Biomedical, Inc. Project), Series 2004 (the “Bonds”) are being issued on behalf of Lifecore Biomedical, Inc., a Minnesota corporation (the “Borrower”), to finance the refinancing of certain indebtedness for the Borrower is hereby irrevocably authorized to draw on M&I Marshall & Ilsley Bank, Irrevocable Letter of Credit Number SB/IRB 314 for account of the Borrower pursuant to a Reimbursement Agreement dated as of August 1, 2004 (as amended or extended, the “Credit Agreement”) between us and the Borrower, available by your drawing upon the terms and conditions hereinafter set forth, an aggregate amount not exceeding USD $5,699,411.00 hereinafter, as reduced from time to time in accordance with the provisions hereof, the “Stated Amount”).

     Of the Stated Amount (a) up to $5,630,000.00 (the “Principal Portion”) may be drawn at any time and from time to time with respect to (i) payment of the purchase price of Bonds or beneficial ownership interests tendered for purchase or (ii) amounts due as principal of the Bonds, whether at maturity or upon acceleration, demand or prepayment or call for redemption; and (b) up to $69,411.00 (the “Interest Portion”) may be drawn at any time and from time to time with respect to payment of up to 45 days’ accrued interest on the Bonds (up to a maximum rate of 10% per annum) whether at interest payment dates, maturity or upon acceleration, demand or prepayment or call for redemption or the interest component of the purchase price of Bonds or

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beneficial ownership interests tendered for purchase on or prior to the stated maturity of the Bonds (provided, however, that any amount drawn with respect to interest may not exceed the amount of unpaid interest accrued and to accrue on the Bonds to the applicable interest payment date or the date fixed for redemption or the purchase date, as determined by you pursuant to the Indenture and herein).

     All interest shall be calculated on the basis of actual number of days over a 365-day or 366-day, as the case may be, year.

     This Letter of Credit shall expire at 4:00 p.m., Milwaukee, Wisconsin time, on September 15, 2007 (the “Expiry Date”). Notwithstanding the foregoing, this Letter of Credit shall expire earlier than such date upon the first to occur of (a) the date of receipt by us of notice from you as Trustee that a Substitute Letter of Credit (as defined in the Indenture) has been issued in substitution for this Letter of Credit and such Substitute Letter of Credit is then effective, which notice shall be in the form of Exhibit F hereto; (b) the date on which we honor a final drawing or drawings available to be made under this Letter of Credit, in which event this Letter of Credit shall expire immediately after we honor such drawing or drawings; (c) the date of receipt by us of notice from you as Trustee of a certificate stating that no Bonds remain outstanding under the Indenture and the Indenture has been discharged, which notice shall be in the form of Exhibit G hereto; (d) fourteen (14) calendar days after the earlier of (i) the date of the acceleration of the Bonds under the Indenture because of the occurrence of an Event of Default or (ii) the date you have received written notice from us to accelerate the Bonds because of the occurrence of an Event of Default under the Credit Agreement, as the case may be; or (e) a Conversion Date for the Bonds of which you have provided us notice in the form of Exhibit I hereto.

     In the event that any Expiry Date of this Letter of Credit as specified in the preceding paragraph is not a Business Day (as hereinafter defined), this Letter of Credit shall expire at 4:00 p.m., Milwaukee, Wisconsin time, on the next following Business Day.

     Upon its expiration, the Letter of Credit and all amendments related thereto shall be returned by you to us.

     Funds under this Letter of Credit are available to you against your written certificate(s) presented to us, signed by an individual purporting to be an authorized officer, appropriately completed, in the form of Exhibit A, B or C hereto as indicated below. Presentation of such certificates shall be made at the offices of M&I Marshall & Ilsley Bank, 770 North Water Street, Milwaukee, Wisconsin 53202, Attention: Trade Services-IRB LC, 10th Floor, or at any other office which may be designated by us by written notice delivered to you.

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     If a drawing in respect of payment for interest on the Bonds or for amounts due at maturity or upon acceleration, demand or prepayment or call for redemption is made by you hereunder at or prior to 1:30 p.m., Milwaukee, Wisconsin time, on a Business Day and provided that such drawing and the documents presented in connection therewith conform to the terms and conditions hereof, we shall initiate a wire to you of the amount specified by 11:00 a.m., Milwaukee, Wisconsin time, on the next Business Day. If such a drawing is made after 1:30 p.m., Milwaukee, Wisconsin time, on a Business Day and provided that such drawing and the documents presented conform to the terms and conditions hereof, we will initiate a wire to you of the amount specified by 11:00 a.m., Milwaukee, Wisconsin time, on the second following Business Day.

     If a drawing in respect of payment of the purchase price of tendered Bonds is made by you hereunder at or prior to 10:30 a.m., Milwaukee, Wisconsin time, on a Business Day and provided that such drawing and the documents presented in connection therewith conform to the terms and conditions hereof, we shall initiate a wire to you of the amount specified by 2:00 p.m., Milwaukee, Wisconsin time, on the same Business Day. If such a drawing is made after 10:30 a.m., Milwaukee, Wisconsin time, on a Business Day and provided that such drawing and the documents presented conform to the terms and conditions hereof, we shall initiate a wire to you of the amount specified by 11:00 a.m., Milwaukee, Wisconsin time, on the next Business Day.

     For purposes of this Letter of Credit, presentation of a certificate shall be made in person, by mail or by telecopy (or other electronic telecommunication) without further need of documentation, it being understood that appropriate certificates submitted via such telecopy (or other electronic telecommunication) are to be the sole operative instruments of drawing; provided, however, that with respect to any drawing which reduces the Stated Amount hereunder to zero (a) if such drawing is made in person or mail, the drawing certificate shall be accompanied by the original of this Letter of Credit and all amendments hereto, and (b) if such drawing is made by facsimile or other electronic means, the original of this Letter of Credit and all amendments hereto shall be sent on the day of such draw by overnight delivery to us at the address set forth below. No sight drafts are required to be presented hereunder. Drawings shall be presented to us at our office located at 770 North Water Street, Milwaukee, Wisconsin 53202, Attention: Trade Services-IRB LC, telecopy number (414) 765-7788 (or such other place or electronic address as we may from time to time specify).

     This Letter of Credit is not negotiable by any financial institution other than M&I Marshall & Ilsley Bank. As used herein “Business Day” shall mean a day in which each of the cities where the principal corporate trust offices of the Trustee and the principal offices of M&I

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Marshall & Ilsley Bank are located is not a Saturday, a Sunday or a day on which banking institutions are authorized or required by law to close.

     Payment of all drawings under this Letter of Credit will be made in immediately available funds and from moneys of M&I Marshall & Ilsley Bank and not from funds of any Borrower under the Credit Agreement.

     No drawing may be made hereunder to pay principal of, or interest on, or the purchase price of, or premium on, any Pledged Bonds (as defined in the Indenture)

     Principal Portion Drawings. Drawings under the Principal Portion to pay principal of the Bonds due to redemption, acceleration, prepayment or maturity (an “A Drawing”) must be made by presentation to us of your appropriately completed written certificate, signed by an individual purporting to be an authorized officer, in the form of Exhibit A hereto. Drawings under the Principal Portion to purchase tendered Bonds or beneficial ownership interests of tendered Bonds (a “B Drawing”) must be made by presentation to us of your appropriately completed written certificate signed by an individual purporting to be an authorized officer in the form of Exhibit B hereto.

     Interest Portion Drawings. Drawings under the Interest Portion to pay interest due and payable on the Bonds (a “C Drawing”) must be made by presentation to us of your appropriately completed written certificate signed by an individual purporting to be an authorized officer in the form of Exhibit C hereto.

     In the case of any A Drawing or B Drawing, the Stated Amount shall automatically be reduced (subject to the provisions below regarding reinstatement with respect to a B Drawing) by (a) an amount of the Principal Portion equal to 100% of the amount of such drawing and (b) unless the Interest Portion has already been reduced pursuant to a C Drawing which has not been reinstated, an amount of the Interest Portion equal to 45 days’ interest on the amount of the Principal Portion drawing calculated at an assumed rate of 10% per annum. In the case of any C Drawing, the Interest Portion shall automatically be reduced by the amount of such drawing except to the extent the Interest Portion has already been reduced because of a concurrent A Drawing.

     Reinstatement of A Drawings and B Drawings. A Drawings shall not be reinstated. Reductions in the Principal Portion and Interest Portion resulting from a B Drawing shall be reinstated upon the resale of all or any portion of the Bonds or beneficial ownership interests purchased with the proceeds of such B Drawing and the receipt by us of (a) such resale proceeds in the amount by which the Principal Portion and Interest Portion of the Stated Amount is to be

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reinstated plus interest due us on such drawing as set forth in the Credit Agreement and (b) a notice from you as Trustee as to the amount by which the Principal Portion and Interest Portion of the Stated Amount is to be reinstated, which notice shall be in the form of Exhibit H hereto.

     Reinstatement of C Drawings. The Interest Portion shall be automatically reinstated in an amount equal to the amount of any reduction resulting from a C Drawing upon the earlier of (a) our receipt from the Borrower, in accordance with the terms of the Credit Agreement, of an amount equal to such C Drawing or (b) the seventh Business Day following the honoring of such drawing. Notwithstanding the foregoing, such amount shall not be reinstated if we shall have delivered written notice to you, as Trustee, which notice shall be given on or before the close of business on the seventh Business Day following the honoring of such C Drawing, that such amount available to be drawn under the Letter of Credit to pay interest on the Bonds has not been reinstated and such notice directs acceleration of the Bonds.

     Likewise, the Principal Portion shall be reduced automatically upon the date notice is received from you in the form of Exhibit E attached hereto appropriately completed that prepayment of the Bonds (whether by optional or mandatory redemption or otherwise) under the Indenture (other than Letter of Credit proceeds) has taken place. The Interest Portion (unless it has already been reduced because of a C Drawing that has not been reinstated) and the Stated Amount shall be reduced proportionately to the reduction in the Principal Portion.

     If there has been an acceleration of the Bonds under the Indenture because of the occurrence of an Event of Default under the Indenture, you must present a drawing hereunder to pay principal and interest then due on the Bonds within thirteen (13) calendar days after the date of the acceleration of the Bonds under the Indenture because of the occurrence of an Event of Default, and the payment date on the Bonds (the “Acceleration Payment Date”) shall not be later than fourteen (14) calendar days from the date of the acceleration of the Bonds under the Indenture because of the occurrence of an Event of Default, and the Interest Portion which would otherwise be available under this Letter of Credit will be reduced to cover interest to accrue on the Bonds only to such Acceleration Payment Date (and the Stated Amount will be reduced correspondingly).

     If we have notified you that an Event of Default has occurred under the Credit Agreement, that we are terminating this Letter of Credit and that we are directing you to cause a mandatory tender of the Bonds, you must present a drawing hereunder to pay principal and interest due with respect to such tender of the Bonds within thirteen (13) calendar days after the date which we have given you such notice and the purchase date for the tender on the Bonds the (“Mandatory Bond Purchase Date”) shall not be later than fourteen (14) calendar days from the date of our notice to you and the Interest Portion which would otherwise be available under this

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Letter of Credit to cover the interest portion of the tender price will be reduced to cover interest to accrue on the Bonds only to such Mandatory Bond Purchase Date (and the Stated Amount will be reduced correspondingly).

     If a demand for payment made by you hereunder does not, in any instance, conform to the terms and conditions of this Letter of Credit, we shall give you prompt notice that the purported demand for payment was not effected in accordance with the terms and conditions of this Letter of Credit, stating the reasons therefor and that we are holding any documents at your disposal or are returning the same to you, as we may elect. Upon being notified that the purported demand for payment was not effected in accordance with this Letter of Credit, you may attempt to correct any such nonconforming demand for payment if, and to the extent that, you are entitled (without regard to the provisions of this sentence) and able to do so.

     Only the Trustee may make a drawing under this Letter of Credit. Upon the payment to the Trustee or to the Trustee’s account of the amount specified in a drawing drawn hereunder, we shall be fully discharged on our obligation under this Letter of Credit with respect to such drawing and we shall not thereafter be obligated to make any further payments under this Letter of Credit with respect to such drawing to the Trustee or any other person who may have made to the Trustee or makes to the Trustee a demand for payment of principal of or interest on or purchase price of any Bond.

     We shall be entitled to conclusively rely upon all certificates for drawing presented to us and we shall have no duty to investigate any facts set forth in any certificates.

     This Letter of Credit applies only to the principal amount of the Bonds and the purchase price of Tendered Bonds or beneficial ownership interests and an amount equal to up to 45 days’ interest accruing on the Bonds on or prior to the redemption date or stated maturity of the Bonds or the tender date with respect to purchased Bonds or beneficial ownership interests, and does not apply to any interest that may accrue thereon after such maturity or redemption date or tender date (unless reinstated as provided above, in the case of purchase price of tendered bonds or beneficial ownership interests). This Letter of Credit does not apply to any redemption premium, if any, or any fees or expenses of the Trustee or the Issuer and no funds are available under this Letter of Credit for payment of any such amounts.

     Communications with respect to this Letter of Credit shall be in writing and shall be addressed to us at 770 North Water Street, Milwaukee, Wisconsin 53002, Attention: Trade Services-IRB LC, 10th Floor or shall be by facsimile at (414) 765-7788 or by other electronic telecommunications, specifically referring thereon to “M&I Marshall & Ilsley Bank Irrevocable

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Letter of Credit Number SB/IRB 314.” We will communicate to you by mail or facsimile or other electronic telecommu