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A slice of grapefruit poppy seed cake garnished with citrus zest and poppy seeds

Grapefruit Poppy Seed Cake

Bright, tart grapefruit meets a tender, buttery crumb in this delightful cake, dotted with poppy seeds, perfect for brunch or an afternoon treat.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 8 servings
Course: Brunch, Dessert
Cuisine: American, Baked Goods
Calories: 250
Ingredients Method Notes

Ingredients
  

Dry Ingredients
  • 1.5 cups all-purpose flour Sifted for a lighter mixture if desired.
  • 1 cup granulated sugar Common pantry staple.
  • 1 teaspoon baking powder Check freshness for effectiveness.
  • 0.5 teaspoon baking soda Check freshness for effectiveness.
  • 0.25 teaspoon salt Use to balance flavors.
  • 2 tablespoons poppy seeds Toss with a teaspoon of flour to prevent sinking.
Wet Ingredients
  • 0.5 cups unsalted butter, softened Choose European-style for richer flavor.
  • 2 large eggs Use room-temperature for best results.
  • 0.5 cups grapefruit juice Use fresh juice for optimal flavor.
  • 1 tablespoon grapefruit zest Grate carefully to avoid bitter pith.
  • 1 teaspoon vanilla extract Enhances overall flavor.

Method
 

Preparation
  1. Preheat your oven to 350°F (175°C) and grease and flour an 8-inch round cake pan.
  2. In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and poppy seeds.
  3. In a large bowl, cream the softened butter and granulated sugar until light and fluffy, about 2-3 minutes.
  4. Add the eggs one at a time, ensuring each is fully incorporated.
  5. Mix in the grapefruit juice, grapefruit zest, and vanilla extract until combined.
  6. Gradually add the dry ingredients and stir until just combined.
Baking
  1. Pour the batter into the prepared cake pan and smooth the top.
  2. Bake for 30–35 minutes, checking at 28 minutes with a toothpick for doneness.
  3. Allow the cake to cool in the pan for 20 minutes before transferring it to a wire rack.
Serving
  1. You can frost with a light glaze made from powdered sugar and grapefruit juice, or enjoy the cake plain.
  2. Let the glaze set for 10–15 minutes before slicing, if used.

Notes

Use room-temperature ingredients for optimal results; check baking powder and soda for freshness for best rise. Store wrapped in plastic in the fridge for up to 4 days, or freeze in slices for up to 3 months.