Indian River Grapefruit Meringue Cake - Florida Citrus

Ingredients

• 1-1/2 large fresh Florida Grapefruit
• 1/4 cup butter or margarine
• 1/2 cup sugar
• 2 egg yolks (reserve whites at room temperature)
• 1 whole egg
• 1 cup all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon grated grapefruit zest
• 1/4 cup milk
• 2 tablespoons fresh Florida Grapefruit Juice
• 1/2 teaspoon vanilla