INGREDIENTS
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1 cup graham cracker crumbs
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3 Tbsp cocoa powder
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1/2 tsp salt
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1 cup sweetened flaked coconut
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1/2 cup walnut pieces
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6 Tbsp unsalted butter, melted
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1 large egg, lightly beaten
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1/2 cup unsalted butter, at room temperature
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2 cups icing sugar, sifted
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2 Tbsp vanilla custard powder
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Pinch of salt
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3 Tbsp milk
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1 tsp vanilla extract
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4 oz semisweet chocolate, chopped
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2 Tbsp unsalted butter
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Sea salt, for sprinkling (optional)