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1
Place the chocolate in a 2-quart mixing bowl.
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2
In a 1-quart saucepan over medium heat, bring the cream to a boil.
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3
Remove from the heat, take 1 tablespoon of hot cream and dissolve the espresso powder in it, then blend it back into the rest of the cream.
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4
Pour the hot cream into the bowl with the chocolate.
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5
Let the mixture stand for 1 minute, then stir together with a rubber spatula, whisk, or immersion blender until thoroughly blended.
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6
Cover the mixture, let cool to room temperature, and chill in the refrigerator until thick but not stiff (2 to 3 hours).
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7
Fit a 12-inch pastry bag with a large, plain round pastry tip with a 1/2-inch opening and fill partway with the ganache mixture.
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8
Pipe the mixture into 1-inch foil candy cups up to the top edge.
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9
Place a mocha bean on top of each cup.
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10
Chill the truffle cups in the refrigerator until they are set (1 hour).
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11
In a tightly covered container wrapped in several layers of aluminum foil, the truffle cups will keep for 1 month in the refrigerator or 2 months in the freezer.
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12
The truffle cups are best served at room temperature.
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13
Hazelnut Ganache Truffle Cups: Omit the espresso powder.
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14
After stirring together the chocolate and whipping cream, stir in 2/3 cup toasted, skinned, finely ground hazelnuts.
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15
Rather than placing a mocha bean on top of each truffle cup, place a toasted, skinned, whole hazelnut, pointed end up on top.
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16
White Chocolate Hazelnut Ganache Truffle Cups: Follow the instructions for Hazelnut Ganache Truffle Cups above, and additionally substitute 10 ounces white chocolate for the bittersweet chocolate.
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17
Milk Chocolate Hazelnut Ganache Truffle Cups: Follow the instructions for Hazelnut Ganache Truffle Cups above, and additionally substitute 9 ounces milk chocolate for the bittersweet chocolate.