How to make toasted lemon meringue cupcakes

Ingredients

• 1/2 cup unsalted butter
• 1 cup sugar
• 1 tbsp granulated lemon peel
• 2 eggs
• 1/2 tbsp white vinegar
• 1 1/2 cup flour
• 1/2 tbsp baking powder
• 1/4 tsp salt
• 1/2 cup milk
• 1 jar, 8 oz lemon curd
• 4 egg whites
• 3/4 cup sugar
• 1/4 tsp cream of tartar
• 1 tsp vanilla extract