Good-Cooking - Daffodil Upside-Down Cake

Ingredients

• 1 cup granulated sugar
• 2 1/2 tablespoons cornstarch
• 1/4 teaspoon salt
• 1 1/2 cups boiling water
• 3 tablespoons butter
• 1 lemon, juice and grated rind
• 1/4 cup butter
• 1/2 cup granulated sugar
• 1 egg, beaten
• 1 1/2 cups flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1/2 cup milk
• Slices from 1 1/2 lemons
• 1 teaspoon grated lemon rind