Lemon Custard in Meringue Cups

Ingredients (13)

• MERINGUE:
• 3 large eggs, separated, room temperature
• 1/2 teaspoon white vinegar
• 1/4 teaspoon vanilla extract
• 1/4 teaspoon salt, divided
• 2 cups sugar, divided
• CUSTARD:
• 1/3 cup cornstarch
• 1-1/2 cups cold water
• 1 tablespoon grated lemon zest
• 6 tablespoons lemon juice
• 2 tablespoons butter
• Sweetened whipped cream