Lemon and Grapefruit Buttermilk Cake

This Lemon and Grapefruit Buttermilk Cake is one of the absolute best-tasting cakes I've made.  It's infused with lemon zest and the juices of both grapefruit and lemon.  A grapefruit glaze is poured over the top of the cake after it's baked which gives the cake an incredibly moist crumb. To further enhance the bold citrus flavor, a lemon icing is drizzled over the top.

An overhead view of Lemon Grapefruit Buttermilk Cake topped with white icing next to a large bowl of grapefruits and oranges

There are so may things I love about this cake...

First off, it's pretty.  No matter what kind of pan you use, the pretty golden crust with the shiny glaze and citrus infused white cream is lovely.

It's also ultra moist.  It isn't dry or dense at all.  The cake also has a wonderful lemony flavor that everyone seems to love.

After the cake bakes and is cooling, I prepare a glaze made with sugar and grapefruit.  I dissolve the sugar in the juice over a medium heat.  When the sugar is dissolved, I pour it over the top of the cake.

Lemon Grapefruit Buttermilk Cake next to a bowl of oranges and grapefruits and half of a grapefruit on a small plate

As the glaze soaks into the cake, I prepare a lemony icing to drizzle over the top.

Drizzling white icing onto the top of a Lemon and Grapefruit Buttermilk Cake next to a large bowl of oranges and grapefruits and half of a grapefruit on a small plate

Drizzling white icing onto the top of a Lemon and Grapefruit Buttermilk Cake next to a large bowl of oranges and grapefruits and half of a grapefruit on a small plate

I adore this pretty cake.  It's everything a citrus cake should be...pretty, bright, buttery and incredibly moist.

Lemon Grapefruit Cake | ZagLeft

Lemon and Grapefruit Bundt Cake

Lemon and Grapefruit Buttermilk Cake, infused with lemon zest and the juices of both grapefruit and lemon, topped with a citrus glaze and lemony icing.
5 from 1 vote
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Prep Time: 20 minutes
Cook Time: 55 minutes
Total Time: 1 hour 15 minutes
Course: Dessert
Servings: 8 servings
Author: Joanie Zisk


  • 3 cups all-purpose flour
  • 1 tablespoon baking powder
  • 1 1/2 teaspoon kosher salt
  • 3 cups sugar
  • 2 tablespoons lemon zest
  • 16 tablespoons butter , softened
  • 4 eggs
  • 1 teaspoon vanilla
  • 3 tablespoons grapefruit juice
  • 2 tablespoons lemon juice
  • 1 cup buttermilk


  • 1/3 cup grapefruit juice
  • 1/3 cup sugar


  • 1 cup powdered sugar
  • 2 tablespoons lemon juice


  • Preheat oven to 350 degrees F.
  • Spray the inside of a bundt pan with cooking spray and set aside.
  • Whisk, flour, baking powder and salt together in a medium bowl. Set aside.
  • Combine sugar, lemon zest and butter together in a large bowl.
  • Add in the eggs, one at at time, beating after each addition and scraping down the bowl with a rubber spatula as needed.
  • Add in the vanilla and the juices and continue mixing for about 30 seconds longer.
  • Reduce mixing speed to low and add dry ingredients in 3 additions, alternating with buttermilk in two additions, beginning and ending with dry ingredients.
  • Pour into prepared pan and bake for 45-50 minutes or until toothpick inserted in the center of the cake comes out clean.
  • Place the pan on a cooling rack and cool, about 30 minutes.
  • Carefully invert the cake onto rack; remove pan and let cake cool completely.
  • While the cake is cooling, prepare the glaze.
  • Combine 1/3 cup of grapefruit juice with 1/3 cup sugar in a small saucepan and cook over low heat until the sugar dissolves. Spoon the grapefruit syrup over the cake.
  • Whisk together the powdered sugar and the lemon juice until smooth. (If the icing seems too dry, add a little more lemon juice. It the icing appears to watery, add a tiny bit more powdered sugar until the desired consistency is achieved).
  • Drizzle icing over the top of the cake.
  • Serve.

The information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for a professional nutritionist’s advice.

About The Author

36 thoughts on “Lemon and Grapefruit Buttermilk Cake”

  1. Jen @ Yummy Healthy Easy

    5 stars
    What a gorgeous cake!! I love that you used grapefruit juice in it – yum! I’m the same way with recipe development! My kitchen is always a crazy mess but somehow in my head, it’s all organized, lol!

  2. This cake is citrus loaded! Love how perfect it is for using up that last remaining winter and early spring citrus fruit…yum!

  3. oh YUM! I’m not a big grapefruit person, but I love lemon and this looks delicious so I’ll have to give it a shot!

  4. Heather @ The Nerdy Fox

    Seriously, I couldn’t even read the recipe because of how GORGEOUS that bundt cake is! I don’t think I’ve ever seen such a pretty cake! Where did you find that pan??

  5. Susan | LunaCafe

    What a stunner I love grapefruit and can’t wait to taste it in this lovely cake.

  6. This cake sounds fantastic and also HOLY SMOKES that pan is amazing. What a beautiful shape!

  7. Ash @ Dirt In My Shoes

    Wow this looks divine!! I love anything with grapefruit so I will have to try this. Pinned 🙂

  8. 5 stars
    I love this pan. I am wanting to make more bundt cakes, but want different pans to do them in.

    1. There are so many pretty bundt cake pans, Candi. They make the cakes so pretty even without frosting.

  9. Chrisy @ Homemade Hooplah

    Oh, this sounds delicious! I love the lemon and grapefruit combo.

  10. Kate @ Diethood

    Wish I was there for all the testing and retesting! 😀 I’m also crazy about citrus desserts and this beautiful cake would definitely feed my obsession!

  11. Barbara | Creative Culinary

    Sometimes I feel like poor grapefruit gets the short shrift; it doesn’t show up near enough in recipes compared to it’s cousins lemon and lime. And I love it…so I will remember this, I’ve got a pink one in the fridge now that needs to be used soon so now I’m thinking cake!

    1. Thanks, Barbara and you’re right – I don’t see very many recipes using grapefruit and I love the taste too.

  12. Heather / girlichef

    I probably would have wanted to try this even if you hadn’t perfected it so perfectly…just the thought of tangy buttermilk and bright citrus makes me hungry. Plus, it’s beautiful!

  13. This looks and sounds amazing! Oh, how I wish I had a piece right now with my morning coffee!

  14. Barrett @dirtylaundrykitchen.com

    Looks really decadent. I love all the grapefruit. And that pan is gorgeous. How nice to have a big kitchen!

  15. Faith (An Edible Mosaic)

    I think this is probably the prettiest bundt cake I’ve ever seen! Love the bright flavors of citrus here.

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