Prepare either the Dream Whip or whip the whipping cream.
Combine flour, brown sugar, walnuts and melted margarine. Spread in a shallow baking pan. Bake for 20 minutes in a 350-degree oven - stirring occasionally.
Sprinkle 2/3 of the baked crumbs in a 13x9-inch pan.
Combine in a large mixing bowl egg whites, sugar, lemon juice and strawberries. Beat at high speed to a very stiff peak (about 10 minutes). Then fold in the prepared Dream Whip or whipping cream.
Spoon this mixture over the crumbs in the 13x9-inch pan. Top with remaining 1/3 crumbs.
Freeze for at least 6 hours.