Grapefruit Poppy Seed Cake

Grapefruit Poppy Seed Cake is a fresh, zesty twist on a classic citrus loaf. Featuring a moist, tender crumb infused with tart grapefruit juice and zest, this cake is speckled with nutty poppy seeds and finished with a tangy grapefruit glaze. It’s a light and vibrant dessert that’s perfect for brunch, tea time, or a sunny afternoon treat.

Why You’ll Love This Recipe

This cake strikes the perfect balance between sweet and tart. The grapefruit adds a bold citrus flavor without being overpowering, while the poppy seeds bring a delicate crunch and a hint of nuttiness. It’s simple to make, visually appealing, and can be served as a breakfast loaf, snack cake, or elegant dessert. Whether you’re a citrus lover or just looking for something unique, this cake delivers.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• All-purpose flour
• Baking powder
• Salt
• Poppy seeds
• Unsalted butter, softened
• Granulated sugar
• Eggs
• Fresh grapefruit zest and juice
• Plain Greek yogurt or sour cream
• Vanilla extract

For the glaze:

• Powdered sugar
• Fresh grapefruit juice
• Optional: grapefruit zest for garnish

directions

1. Preheat oven to 350°F (175°C). Grease and line a loaf pan with parchment paper.
2. In a bowl, whisk together flour, baking powder, salt, and poppy seeds.
3. In a separate large bowl, cream butter and sugar until light and fluffy.
4. Beat in eggs one at a time, then add grapefruit zest, juice, yogurt, and vanilla. Mix until smooth.
5. Gradually add dry ingredients to wet, stirring until just combined.
6. Pour batter into prepared pan and smooth the top.
7. Bake for 45–55 minutes, or until a toothpick inserted in the center comes out clean.
8. Let the cake cool in the pan for 10 minutes, then transfer to a wire rack.
9. Mix powdered sugar with grapefruit juice to make the glaze. Drizzle over the cooled cake and top with zest if desired.

Servings and timing

Serves 8–10
Prep time: 15 minutes
Bake time: 50 minutes
Cool and glaze time: 20 minutes
Total time: 1 hour 25 minutes

Variations

• Lemon or Orange Twist: Swap grapefruit for lemon or orange juice for a different citrus flavor.
• Mini Loaves: Divide batter into smaller pans for individual cakes or gifts.
• Coconut Glaze: Add a splash of coconut milk to the glaze for a tropical twist.
• Grapefruit Almond Cake: Replace part of the flour with almond flour and top with sliced almonds.
• Gluten-Free Option: Use a 1:1 gluten-free flour blend for a gluten-free version.

storage/reheating

Store the cake in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days.
To freeze, wrap the unglazed cake tightly in plastic wrap and foil; freeze for up to 2 months. Thaw at room temperature and glaze before serving.
To reheat a slice, warm in the microwave for 10–15 seconds.

FAQs

Can I use bottled grapefruit juice?

Fresh juice is recommended for the best flavor, but bottled can work in a pinch—choose one with no added sugar.

What type of grapefruit works best?

Ruby red or pink grapefruits are ideal for their natural sweetness and vibrant color.

Can I use yogurt instead of sour cream?

Yes, plain Greek yogurt works perfectly and adds moisture and a slight tang.

Why did my cake sink in the middle?

This can happen if the batter is overmixed or the oven temperature is too low. Make sure to follow directions carefully and avoid opening the oven early.

Can I omit the poppy seeds?

Yes, the cake will still be delicious without them—they add texture but aren’t essential.

Can I make this into cupcakes?

Yes, divide the batter into muffin tins and bake at 350°F for 18–22 minutes.

How do I know when the cake is done?

The top will be golden and a toothpick inserted into the center should come out clean.

Is this cake very sweet?

It has a balanced sweetness with the slight bitterness of grapefruit—perfect for those who prefer less sugary desserts.

Can I double the recipe?

Yes, just use two loaf pans or one large Bundt pan and adjust the baking time accordingly.

What should I serve with this cake?

It pairs beautifully with tea, coffee, or a dollop of whipped cream or Greek yogurt.

Conclusion

Grapefruit Poppy Seed Cake is a bright, beautiful bake that’s equal parts refreshing and comforting. With its citrusy flavor, tender crumb, and crunchy glaze, it’s a lovely way to showcase seasonal grapefruit. Whether served for brunch or dessert, this cake brings sunshine to the table with every slice.

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