Coffee Buttercream

Make this delicious coffee buttercream frosting to go with our chocolate-and-coffee Opera Cake. Serve it to guests at the end of the night after the wedding cake, and they'll be sure to thank you.

  • Yield: Makes about 2 1/2 cups

Source: Martha Stewart Weddings, Fall 2010

Ingredients

  • 1 tablespoon instant espresso powder
  • 1 tablespoon boiling water
  • 3/4 cup sugar
  • 3 large egg whites
  • 2 sticks unsalted butter, room temperature, cut into tablespoons
  • 1/2 teaspoon pure vanilla extract

Directions

  1. Place espresso powder in a small cup; add the boiling water, and stir to dissolve. Let cool.

  2. Bring a saucepan with about 2 inches of water to a simmer. Combine sugar and whites in a large heatproof mixer bowl set over (not in) simmering water. Whisk until whites are warm to the touch and sugar is dissolved, 2 to 3 minutes.

  3. Place bowl on mixer stand; whisk on low speed until mixture is foamy. Whisk on medium-high until stiff, glossy peaks form and mixture is completely cooled completely, about 10 minutes.

  4. Reduce speed to medium-low; add butter 2 tablespoons at a time, whisking to incorporate fully well after each addition (if buttercream appears curdled, at this point simply beat until smooth). Whisk in vanilla and espresso mixture.

  5. Switch to paddle attachment; beat on lowest speed to reduce air bubbles, 3 to 5 minutes.

Cook's Notes

To store, refrigerate airtight up to 3 days, or freeze up to 1 month. Before using, bring to room temperature; beat with paddle attachment on the lowest speed until smooth and pliable, about 10 minutes.

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