Dear Abby's Tuna Casserole

1 1/2 cups cooked yams or sweet --
potatoes --
puree 1 1/4 cups sugar 1/2 cup butter or margarine --
melt 1/4 cup evaporated skim milk 3 eggs 1 teaspoon ground nutmeg 1 teaspoon vanilla 3/4 teaspoon lemon extract 1 9" unbaked deep-dish pie --
shell

Preheat oven to 350~. In processor combine all ingredients except crust. Process until well-blended. Pour into unbaked pie shell. Bake for 50 to 55 minutes or until knife inserted in center comes out clean and pie is golden-brown.