For Sauce: Melt butter or margarine in pan. Add flour, salt and pepper. Mix well, gradually add milk and stir constantly until sauce becomes thick. Set aside.
Put tuna in a large bowl and flake with a fork; add lemon juice. Add other ingredients and pour into white sauce. Mix well and pour into greased casserole. Casserole may be frozen at this point for use at a later date. Bake uncovered at 350 degrees F for 30 minutes. Remove from oven, add biscuits to the top and bake 15 minutes more.
By Robin from Washington, IA
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