INGREDIENTS
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Unsalted butter, at room temp- 1/2 Pound
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Sugar - 1/2 Cup
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Egg Yolk, Large - 1
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Salt - 1/2 Teaspoon Salt
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All Purpose Flour - 2 1/2 Cups
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Large Egg Whites - 4
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Sugar - 1 Cup
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Ground Walnuts - 3/4 Cup
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Lemon Extract - 1 Teaspoon
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Blackberry Jelly - 1 Cup
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Walnuts, Chopped - 1/4 Cup