Frosty Strawberry Squares

1 cup flour
1/4 cup brown sugar
1/2 cup chopped nuts
1/2 cup butter melted
2 egg whites
1 cup sugar
2 cups frozen strawberries
2 T lemon juice
1 cup whipping cream

Mix together flour, brown sugar, nuts, and butter. Spread in shallow pan. Bake at 350 deg. for 20 minutes. Stir while baking as it burns easily. Spread 2/3 of the crumbs in cake pan. Combine egg whites, sugar, berries and lemon juice. Beat at high speed until stiff peaks form. Whip cream and fold into berry mixture. Spoon mixture over crumbs in cake pan. Sprinkle with remaining crumb mix. Freeze at least 6 hours.