1 c. flour
1/2 c. chopped nuts
1/4 c. brown sugar
1 stick butter

Combine ingredients for crust in 13 x 9 x 2 inch baking dish. Bake in 350 degree oven for 20 minutes, stirring often. Reserve 1/4 cup for topping; spread the rest evenly in the bottom of pan.

FILLING:

1 (10 oz.) pkg. frozen strawberries
1 c. sugar (2/3 c. sugar if berries are sweetened)
2 egg whites
2 tbsp. lemon juice
1 (10 oz.) pkg. frozen whipped topping

Meanwhile, mix frozen berries, sugar, egg whites and lemon juice at high speed in mixer until light and foamy. Fold in thawed topping. Sprinkle reserved crumbs on top; freeze overnight. Remove 15 minutes before serving; cut into squares to serve.