Grapefruit Sour Cream Cake

This Grapefruit Sour Cream Cake is amazingly moist, bright with citrus and tart from the sour cream. A delicious cake best served with coffee or tea!

Seeing that it’s Friday and all I thought we should celebrate with cake.

Grapefruit Sour Cream Cake Slice
A ruby red grapefruit cake to be exact.

grapefruit collage
Last Friday a big ol’ box of grapefruit was delivered to my front door {thanks to TexaSweet}. The box came a little damaged and dented {thanks delivery man!}, but when I opened it up and saw those beauts all was forgotten. After I made this cake I squeezed one grapefruit and strained it into a glass and drank it. SO darn good!

While pending the arrival of my grapefruits I devised a plan on how I was going to go about making the cake part. I borrowed the recipe from this post and the technique from this post, did a little ingredient swapsies and *poof!* this beautiful cake (that sort of tastes a bit like Froot Loops #notevengonnalie)… was born.


For the cake you’ll need the usual: flour, sugar, salt, baking powder, eggs, milk ,{melted} butter. You’ll also need some sour cream and two grapefruits!


Start off by measuring 1 cup of sugar and pour it into a large bowl.

grapefruit sugar
Zest the grapefruits until you have two tablespoons and then add it into the sugar bowl. Use your fingers and rub the sugar into the zest until the texture feels like wet sand.

pink grapefruit
Cut the grapefruit in half. I used a juicer and then strained the freshly squeezed grapefruit juice until I had 3 tablespoons worth.

eggs, grape fruit juice, butter and mixed

In the bowl with the grapefruit sugar; crack two eggs, add the grapefruit juice, add the melted butter and give it all a good whisk.

salt, bpowder and whisk

In a smaller bowl combine the flour, salt and baking powder. Give that a good whisk too, to break up and clumps and fluff it up a bit.

mix sour cream and milk
In a small bowl or measuring cup stir together the half cup of sour cream and the two tablespoons of whole milk. This just makes adding to the batter more simple.

whisk and pour
Alternately add a third of the dry ingredients, then a third of the sour cream mixture until it’s all incorporated. Pour the cake batter into a lined loaf pan. Bake in a preheated 350 degree oven for 45 minutes or until a tester comes out clean. Do NOT over bake!

baked cake
Let the cake cool in the pan for 10-15 minutes before removing.

run your knife
Run a knife along the edge touching the pan and then use the parchment paper to lift it out on to a wire rack to finish cooling. Now go do a load of laundry.

Sooo yeah, I made this glaze. 1 cup powdered sugar, 1 {heaping} tablespoon of sour cream and then thinned it out with some whole milk. Uhhh yeah try NOT to drink this stuff… I dare you.

Annnnnd then I drizzled it all over the cake. Boo-yah!

Grapefruit Sour Cream Cake Slice

Pink Grapefruit Sour Cream Cake


Grape Fruit Sour Cream Cake Bite

And devour! It’s cakes like this that I wish I had the metabolism of a twelve-year-old because I’d eat this whole thing in a nano second. Like one second there’s a beautiful cake just sitting there and then *poof!* it’s gone and the only evidence is the crumbs on my chin. Awww yeah… to be twelve again.


Enjoy! And if you give this Grapefruit Sour Cream Cake recipe a try, let me know! Snap a photo and tag me on twitter or instagram!

Grapefruit Sour Cream Cake Tops

My cookbook Simply Scratch : 120 Wholesome Homemade Recipes Made Easy is now available! CLICK HERE for details and THANK YOU in advance! 


Ruby Red Grapefruit Sour Cream Cake

Yield: 12 servings

Prep Time: 30 minutes

Cook Time: 45 minutes

Total Time: 1 hour 15 minutes


1 cup Sugar

2 tablespoons Ruby Red Grapefruit Zest

2 whole Eggs

3 tablespoons freshly squeezed Ruby Red Grapefruit Juice, strained

1/3 cup Butter, melted and cooled

1-1/2 cup All Purpose Flour

1 teaspoon Kosher Salt

1 teaspoon Baking Powder

1/2 cup Sour Cream

2 tablespoons Whole Milk


1 cup Powdered Sugar

1 tablespoon Sour Cream

1 to 2 tablespoons Whole Milk


Preheat your oven to 350 degrees and line an 8x5 loaf pan with parchment paper, then spray with cooking spray {I use my Misto}.

In a large bowl combine the sugar and the two tablespoons of grapefruit zest. Use your fingers and rub the zest into the sugar until it resembles wet sand.

Add the two eggs, grapefruit juice and melted butter. Stir until those ingredients are incorporated.

In a separate bowl, combine the flour, salt and baking powder. Give it a good whisk to remove and clumps.

In a small bowl or measuring cup; combine the sour cream and milk and stir until combined.

Starting with the flour and ending with sour cream/ milk mixture. Alternate and a third of each until everything is mixed in well.

Pour the cake batter into the prepared pan and bake for 45 minutes or until a tester comes out clean. Let the cake rest in the pan for 10 minutes before running a knife along the edge and using the parchment paper to lift the cake out of the pan.

Let the cake cool completely on a wire rack. Mean while make the glaze by combining the powdered sugar, sour cream and thinning it out with the milk.

Drizzle the glaze over the cooled cake and let it sit to harden for a few minutes.

Slice and serve!

[this post contains affiliate links.]

Note: TexaSweet in no way compensated me for this post. They simply sent me a shipment of their glorious ruby reds out of the kindness of their hearts and I blogged about using it this Grapefruit Sour Cream Cake… it’s as simple as that. My opinions are my own and I love these grapefruits!

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36 Responses to “Grapefruit Sour Cream Cake”

  1. #
    Antonia @ Health Inspirations — January 18, 2013 at 10:41 am

    You really come up with the most creative und beautiful looking desserts and meals. The next time I get my hand on some juicy grapefruit I’ll be making this! Why only have grapefruit for breakfast when you can have it in cake?!

    • simplyscratch replied: — January 19th, 2013 @ 1:27 am

      Thank you Antonia 🙂

  2. #
    Jennifer @ Mother Thyme — January 18, 2013 at 1:04 pm

    Great idea! I only wish I had a metabolism of a twelve year old as well. I could devour this entire cake in no time!

  3. #
    Aparna B. @ Not A Leaf — January 18, 2013 at 2:20 pm

    Ohhh my goodness. This just happened. Like for reals. And it looks so beautiful and sounds even better! The grapefruit color is so gorgeous! I agree with Jennifer – it would be hard not to eat it all at once!!

    • simplyscratch replied: — January 19th, 2013 @ 1:29 am

      It totally was.. but I stopped myself at two pieces… and that was just for breakfast :/

  4. #
    sally @ sallys baking addiction — January 18, 2013 at 2:29 pm

    laurie, this cake is positively gorgeous. i have been meaning to use my grapefruits in an actual recipe, but don’t ever do it! I would love a huge slice of this right now with my lemon tea. 🙂 And i still drool over your lemon blueberry cake load w/ buttermilk icing every time I see it. omg. 🙂

  5. #
    Heather (Heather's Dish) — January 18, 2013 at 3:01 pm

    You’re sooooo rubbing it in my face that I need to get my tush to the store and get some grapefruit already. 🙂

  6. #
    Kelli H (Made in Sonoma) — January 18, 2013 at 3:04 pm

    I. want. <3

  7. #
    Julia {The Roasted Root} — January 18, 2013 at 3:28 pm

    It’s perfect! By golly, it’s perfect! You’re quite the baker – the cake looks delicious and pretty and I love that you used grapefruit – I’ve never tried baking with grapefruit juice before and it’s magnificent!

  8. #
    Tanya — January 18, 2013 at 5:24 pm

    Sweet Heaven! I have some grapefruit coming my way next week, and I just may have to make this cake instead of eating them straight up. I think I just drooled on my keyboard.

    • simplyscratch replied: — January 19th, 2013 @ 1:30 am

      Ha ha! Hey it happens 😉

  9. #
    Katrina @ Warm Vanilla Sugar — January 18, 2013 at 6:09 pm

    This looks so fabulous! Looove this idea!

  10. #
    Kathy C — January 18, 2013 at 6:47 pm

    This looks great. Never thought of making a cake using grapefruit. Fantastic idea.

  11. #
    tijuana (po' man meals) — January 18, 2013 at 7:06 pm

    i LOVE grapefruit. i just bought 2 big bags of grapefruit, too. recently on food network, i saw sunny anderson make this baked grapefruit dessert with sweetened grapefruit slices, vanilla ice-cream and meringue. but i think i may have to make this instead. very genius idea!

  12. #
    Amber @Sprinkled With Flour — January 18, 2013 at 7:08 pm

    Girrrrl, this cake looks scrumptious! I love me some grapefruit, and putting it in cake is…icing on the cake! Pun intended. Lol:) Yes, I’m a dork.

  13. #
    Ashley - baker by nature — January 18, 2013 at 7:09 pm

    Wow – your photos are stunning! This cake looks and sounds pretty much perfect 🙂 happy Friday!

  14. #
    a farmer in the dell — January 18, 2013 at 7:16 pm

    I love grapefruit but have never baked with it. This looks so stinking delicious. What a great way to start the weekend. I think I will have a slice of this for breakfast tomorrow!

    • simplyscratch replied: — January 19th, 2013 @ 1:31 am

      Sounds like a great plan!

  15. #
    Jennifurla — January 18, 2013 at 7:46 pm

    looks delish, love all of your step by step pics.

  16. #
    Muna Kenny — January 18, 2013 at 8:59 pm

    Simple ingredients made such gorgeous cake, looks fluffy and moist, love it!

  17. #
    Julia — January 18, 2013 at 9:23 pm

    I love grapefruits & this bread sounds delicious! Beautiful photos too!

  18. #
    Kelli @ The Corner Kitchen — January 18, 2013 at 9:28 pm

    What a beautiful cake, Laurie! Oh, what I’d do for a slice right now…

    Where did you find your plates? So cute!

    • simplyscratch replied: — January 19th, 2013 @ 1:31 am

      I got them at Pier1 ! Recently too! 🙂

  19. #
    Herbivore Triathlete — January 18, 2013 at 10:33 pm

    That is one beautifully delicious looking cake you’ve got there! I love citrus at this time of year.

  20. #
    Stephanie @ Eat. Drink. Love. — January 19, 2013 at 3:57 am

    I love using lemon, limes, and oranges in cakes, but I haven’t tried grapefruit. It sounds so good!

  21. #
    LINA — January 19, 2013 at 6:49 am

    HI Cheeky,
    Ya know, if it wasn’t for the graphic outlay of your step by step pics, I wouldn’t notice the essence of your creations! But your photos & vocab. are so inviting! thanks for another scrumptious recipe to add to the collection. I can’t go past this Grapefruit cake! My cellulite thigh sisters are indebted to you! LOL….

  22. #
    Erin @ Dinners, Dishes and Desserts — January 19, 2013 at 2:34 pm

    I am not a huge fan of grapefruit, but I WANT this cake!

  23. #
    Jessica@AKitchenAddiction — January 21, 2013 at 6:21 pm

    I was just given a big bag of grapefruit and was wondering how I was going to eat them all before they went bad. . .I now know how to put them to good use!

  24. #
    Chung-Ah | Damn Delicious — January 29, 2013 at 6:20 am

    Oh man I think I have to do an emergency grocery run so I can stock up on some grapefruit for this!

  25. #
    Jackie — February 4, 2013 at 12:01 pm

    Hi Laurie

    I was wondering if I could just use baking spray with flour for the pan instead of the parchment paper, or is the parchment paper for this recipe.

  26. #
    Vicki Bauer — February 20, 2013 at 11:20 pm

    My mouth is watering just thinking about the red grapefruit in my kitchen — just arrived today fresh from the market. I love to peel one each morning for breakfast. That way you don’t miss a drop of juice or a morsel of pulp. Bet you can guess what I’m making in my kitchen tomorrow. The ruby red grapefruit sour cream cake! In fact, I’m going to be a good neighbor and make one for the family across the street. I’m thinking about reducing the sugar in the cake to maybe 1/2 to 3/4 cup. I really love dessert that’s not too sweet.

    Thanks for a beautiful recipe. I’m inspired. 😉

    • simplyscratch replied: — February 21st, 2013 @ 3:53 pm

      Hi Vicki! I totally agree with you! I love grapefruits too and that’s extremely thoughtful of you to make a cake for your neighbor!

  27. #
    Carrie — April 16, 2013 at 10:51 pm

    I have now made this twice in the past week. Once using Greek yogurt rather than sour cream and it is fabulous! The only thing I have noticed is it takes at least 30 minutes more than the recipe says to bake it, but I know each oven is different. It is definitely worth the wait.

    P.S. My favorite part is mixing the sugar and grapefruit zest. 🙂

  28. #
    Sonia — May 1, 2013 at 2:16 pm

    Made this yesterday and Loved it. Added a tbsp of grapefruit juice to glaze also and perhaps thats why it took a little longer to solidify .Nevertheless tasted great
    Thanks again

    • simplyscratch replied: — May 1st, 2013 @ 10:35 pm

      So glad! I love that cake!

  29. #
    Kim — March 17, 2014 at 6:29 pm

    I found this recipe on pinterest and I love it! I have made it many times, and my husband raves about it. It has been a great way for me to learn about your blog. Thanks!

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