INGREDIENTS
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3 ounces unsweetened chocolate
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1/2 cup unsalted butter, at room temperature
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3/4 cup confectioner’s sugar
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1 teaspoon vanilla
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3 tablespoons coffee liqueur (such as Kahlua), plus another 4 tablespoons for building jars
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1 1/4 cup whipping cream
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2 tablespoons granulated sugar
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3 slices chocolate pound cake*, unglazed
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Also needed: 6 half-pint (8-ounce) mason jars
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Garnish: Halved chocolate wafer cookies or grated semi-sweet chocolate