Ruby Red Grapefruit Sheet Cake with Grapefruit Cream Cheese Frosting

Ingredients

• CAKE
• 1 ruby red grapefruit (3 tablespoon zest, divided, and ½ cup juice from grapefruit. You will use 2 tablespoons zest in the cake and 1 tablespoon in the frosting.)
• 1 cup butter, melted
• ½ cup water
• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 teaspoon baking soda
• ½ teaspoon salt
• ½ teaspoon ground cinnamon
• ½ cup buttermilk
• 2 large eggs
• 1 teaspoon vanilla extract
• 1 teaspoon vanilla extract
• 4 cups confectioners sugar
• *1 tablespoon grapefruit zest (from 3 tablespoons listed above)