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Ingredients
- 1/2 pound unsalted butter, softened
- 1 large egg yolk (optional)
- 1 pound confectioners' sugar
- 1/4 cup plus 2 tablespoons heavy cream
- 1 teaspoon pure vanilla extract
- Pinch of salt
- 1 teaspoon finely grated lemon zest
- 1 1/2 tablespoons fresh lemon juice
Preparation
Step 1
In a standing mixer fitted with the whisk, beat the butter and egg yolk at medium-high speed until creamy. Beat in the sugar at low speed. Beat in the cream, vanilla and salt, then beat at medium-high speed until fluffy, 3 minutes longer. Beat in the lemon zest and juice.