Pai Malaikat Lemon

Bahan-bahan (8 porsi)

• 4 egg whites
• ¼ teaspoon cream of tartar
• 1 cup gula pasir
• 4 egg yolks
• ½ cup gula pasir
• ¼ cup fresh lemon juice
• 1 ½ tablespoon lemon zest
• 1 pinch salt
• 2 tablespoons unsalted butter, (room temperature)
• 2 cups heavy whipping cream
• 2 tablespoons gula bubuk