Apple Hurricane Cake

FOR THE TOPPING:

1 egg

4 tablespoons granulated sugar

1 tablespoons cornstarch

1 cup whole milk

2 teaspoons vanilla extract

FOR THE CAKE:

1 1/2 apples

juice of 1/2 lemon

1/2 cup granulated sugar

pinch of salt

2 eggs

2 teaspoons vanilla extract

1/2 cup whole milk

1 2/3 cups all-purpose flour

2 teaspoons baking powder

powdered sugar for dusting

FOR THE TOPPING: