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Mix flour, brown sugar, walnuts and butter together.
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Bake in shallow pan at 350 degrees for 20 minutes, stirring occasionally.
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Sprinkle 2/3 of the crumbs in a 9x13 pan.
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Combine sugar, berries and lemon juice in a bowl and set aside.
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Beat whipping cream and egg whites on high speed for 10 minutes then mix together with the sugar and berries.
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Pour over crumbs.
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Top with remaining crumbs.
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Freeze for 6 hours. Serves 12.