CRUST:

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

FILLING:

10 oz. frozen strawberries
3 unbeaten egg whites
1 tbsp. lemon juice
1 c. sugar
9 oz. Cool Whip

Blend crust ingredients together and spread evenly over the bottom of 9 x 12 inch pan. Bake at 325 degrees for 15 to 20 minutes. With a fork, separate the mixture into crumbs while baking. Cool. Remove 1/3 crumbs from pan and set aside. Smooth out remaining mixture evenly over pan. Place first 4 ingredients of filling in a large bowl and beat at high speed for 15 minutes. Fold in Cool Whip. Pour over prepared crust. Sprinkle with remaining crumbs and freeze. Serve frozen.