Pink Grapefruit Yogurt Cake Ingredients For Cake: 3/4 cup plain Greek (or Vegan/non-dairy) yogurt 1 cup granulated sugar Zest of 1 1/2 pink grapefruits 3 large eggs (or use an egg replacer, such as Ener-G if you are Vegan) 1 1/2 cups all purpose flour 2 teaspoons baking powder 1/4 teaspoon salt 1/2 teaspoon vanilla