In a bowl, toss biscuit mix with 1/2 cup cheese; stir in 2/3 cup milk until a sticky dough forms. Pat dough into a greased 9"x9" baking pan; set aside. In a separate bowl, mix together tuna, celery, onion, olives, half of soup and pimentos, if using. Spoon tuna mixture over dough. Bake, uncovered, at 450 degrees for 25 to 35 minutes. In a saucepan over low heat, combine remaining cheese, milk and soup. Cook until hot and cheese is melted. To serve, cut casserole into squares; ladle sauce over individual squares.
Tip: A crisp green salad goes well with all kinds of main dishes. For a zippy lemon dressing, shake up 1/2 cup olive oil, 1/3 cup fresh lemon juice and one tablespoon of Dijon mustard in a small jar. Chill to blend.
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