Star Ruby Grapefruit Cake with Mint Glaze

Star ruby grapefruits are beautiful to look at – one of the darkest red of the grapefruit varieties – and pack a nutritional punch. There are many ways to enjoy them from breakfast to dessert. Here’s one of the latter, a rich sour cream cake with the bright flavor of red grapefruits, and a luscious mint infused glaze.
Course Dessert



  • 1 cup granulated sugar
  • 2 tablespoons red grapefruit zest
  • 2 large eggs
  • 3 tablespoons ruby red grapefruit juice freshly squeezed
  • 1 banana smashed
  • 1/3 cup unsalted butter melted and cooled
  • 1 1/2 cup all-purpose flour
  • 1 teaspoon salt
  • 1 teaspoon baking powder
  • 1/2 cup sour cream
  • 2 tablespoons whole milk


  • 1 cup powdered sugar
  • 1 teaspoon fresh mint minced
  • 3 tablespoons red grapefruit juice
  • 3 tablespoons finely chopped pecans



  • Preheat oven to 350°F, and prepare an 8” x 5” loaf pan.
  • Add the sugar and grapefruit zest to a large bowl. Combine until the mixture resembles a grainy paste. You can use your hands to rub it together.
  • Beat the mixture as you add the eggs, grapefruit juice, and butter.
  • Add the smashed banana, and combine until thoroughly blended.
  • In another bowl, sift together the flour, salt, and baking powder.
  • Combine the sour cream and milk in a small bowl and whisk until thoroughly blended.
  • Add about a third of the flour mixture to the egg/grapefruit mixture, stirring continuously as you do.
  • Now add about a third of the sour cream/milk mixture, continuing to stir.
  • Repeat until you have incorporated all the ingredients into one smooth batter.
  • Transfer the batter into the loaf pan. Bake for about 45 minutes, or until a toothpick inserted into the middle comes out clean.
  • Allow the cake to rest for about 15 minutes before you transfer to a wire rack to cool.


  • Combine all the ingredients and blend thoroughly.
  • You can add more icing sugar or grapefruit juice to get the consistency you want.
  • Drizzle over the cake, and serve.
Keyword Star Ruby grapefruit
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