INGREDIENTS
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1 pound bittersweet (not unsweetened) or semisweet chocolate, chopped
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3/4 cup (1 1/2 sticks) unsalted butter, room temperature
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2 ounces unsweetened chocolate, chopped
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2 teaspoons instant espresso powder
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3 cups sugar
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1 12-ounce can fat-free evaporated milk
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1 1/2 cups walnut pieces, toasted
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1 tablespoon vanilla extract