Ingredients
- 4 egg whites, at room temperature
- 1 cup superfine baker's sugar
- 1/4 teaspoon sea salt
- 1/4 teaspoon cream of tartar
- 2 tablespoons lemon zest (from 2 large lemons)
- 1 cup fresh raspberries
- 1 cup fresh blackberries or blueberries, see Cook's Note
- 2 tablespoons sugar
- 1 tablespoon fresh lemon juice
- 1 cup mascarpone cheese, at room temperature
- 2 tablespoons sugar
- 1 teaspoon pure vanilla extract
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