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Grapefruit Curd in Grapefruit Cake

February 5, 2016 by Joy the Baker 48 Comments

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Grapefruit Curd in Grapefruit Cake

We had an avocado tree in our backyard growing up, in one of the more concrete-y neighborhoods of central Los Angeles.  It was the humble avocado tree behind the kinda-rusted, maybe a little dangerous, still totally playable swing set in our patchygrass, mangy dog wandering, backyard.  

I think of the relentless to-do list my parents upheld while my sister and I were kids… things like:  go to work, survive work, have food in the house, pay the light bill, raise not asshole children… having a fluffy-grassed backyard wasn’t a huge priority.  But this avocado tree in the corner of backyard was a little oasis!  I should tell you now that it had no avocados.  Never did.  Not even one time… I know because I would check ALL THE TIME.  It did however, provide a small ring of shade at most points in the afternoon and it was a fine tree with upstanding morals and values.  

At some point in my 18 years of living in that house and tip toeing around that backyard, someone mentioned that we had a male avocado tree which… well, it seemed rather strange that this tree would have a gender.  I often wondered (once I was old enough to wonder such things), if there was a female avocado tree in a neighboring backyard that was just bursting with fruit because of our humble, unassuming, un-avocado-ing male avocado tree.  

Likely not.  It’s not that we had a male avocado tree, it’s that avocado trees have this very delicate fruit bearing system.  I know you’re curious so I’ll explain it to you before we talk about grapefruit cake.  We’re definitely going to talk about cake.  See… avocado tree flowers have both male and female parts but they don’t release those parts at the same time.  A flower opens and releases its female parts first.  Closes.  Then the male parts open, and then close.  All the while waiting for the right bee at the right time to take the right pollen to the right flower.  AKA:  Earth is amazing… and we probably just needed a buddy tree for our avocado tree for them to both pollinate and flourish and provide more than greenery and shade.  

I say all of this to say that big beautiful fruit (we’re talking about grapefruit now) that emerges from small flowers is, if you think about it and we’re thinking about it, AMAZING… and should be turned to curd and into cake (and if you’re an avocado, definitely guacamole).  If you’re lucky enough to have a grapefruit (or avocado) tree in your backyard… or in your neighbor’s yard within stealing distance… you should hug it and thank all of the bees around you.  

And now we’re going to make a cake.  

Grapefruit Curd in Grapefruit Cake

Curd and cake.  Both with grapefruit.  Both from scratch.  

First the curd.  Citrus curd, which we should be making my the pint-full right now, is a rich, slow stove top custard with grapefruit juice and a pinch of ground cloves.  

Grapefruit Curd in Grapefruit Cake

To start the curd, grapefruit juice (fresh squeezed is preferable) is simmered on the stoptop to reduce the juice and intensify the flavor.  While the juice simmers, butter and sugar are whipped together in a heat-proof metal bowl.  This bowl will turn into a double boiler, so we need it to conduct heat.  

Grapefruit Curd in Grapefruit Cake

Grapefruit Curd in Grapefruit Cake

Egg yolks are whisked into the butter and sugar mixture.  Egg yolks and whole eggs will work to thicken the curd.  

How long before we’re weirded out by the word ‘curd’?  Is it already happening? (Yes.)

Grapefruit Curd in Grapefruit Cake

The reduced grapefruit juice is cooled slightly and whisked into the butter, sugar and egg mixture.  Whisked well, it becomes a bit frothy on top.  We’re on the right track.  

In a small pot, bring a few inches of water to a boil and place the metal bowl over the simmering water.  It’s a double boiler, and it’s a gentle way to coax our eggs into slowly thickening into a spreadable curd.  

With constant whisking (which means no multi-tasking) the mixture will thicken to a warm pudding consistency after 8 to 10 minutes.  

Grapefruit Curd in Grapefruit Cake

We’ve got our curd and now it’s time for cake.  

Easy cake times thanks to Food52.  We’re not going to over-complicate things here.  

Grapefruit Curd in Grapefruit Cake

Grapefruit Curd in Grapefruit Cake

Softened butter and sugar are creamed together with grapefruit zest until very pale and fluffy.  Hand mixer or stand mixer, but really fluff the butter.  

The grapefruit curd is cooled slightly and 3/4 cup of our tangy grapefruit curd is added to the butter and sugar mixture.

Eggs are then beaten into the mixture, one by one.   

Grapefruit Curd in Grapefruit Cake

Self-rising flour (flour + baking powder + salt) is added to the fluffy curd batter, making this recipe.   No fuss.

If you don’t have self-rising flour on hand, make your own self-rising flour just like this! 

Grapefruit Curd in Grapefruit Cake

The batter is spooned into an 8-inch pan and another 3/4 cup of grapefruit curd is lightly swirled into the batter.  

We’re great.  Now is a good time to acknowledge that.  

Grapefruit Curd in Grapefruit Cake

Baked to golden brown, the curd caramelizes a bit while the cake is tremendously tender. 

It’s the prefect afternoon tea cake, or morning coffee cake, or midnight snack with milk cake.  It’s cake.  Whenever and however.  This is the kind of cake you hope to casually have on hand when your neighbors casually drop by unexpected on a weekend afternoon.  You hope hope hope that the stars align and you have this cake to offer them.  I say bake the cake, open the windows, and see if you can lure them over.    

Grapefruit Curd in Grapefruit Cake

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Grapefruit Curd Grapefruit Cake

★★★★★ 5 from 1 reviews
  • Author: Joy the Baker
  • Prep Time: 30
  • Cook Time: 45
  • Total Time: 1 hour 15 minutes
  • Yield: 8 1x
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Ingredients

Scale

For the Grapefruit Curd

  • 1 cup freshly squeezed grapefruit juice, seeds strained
  • 5 tablespoons unsalted butter, softened to room temperature
  • 1/2 cup granulated sugar
  • 2 large egg yolks, at room temperature
  • 2 large eggs, at room temperature
  • 1/8 teaspoon sea salt
  • 1/8 teaspoon ground cloves
  • 1 tablespoon freshly squeezed lemon juice, strained

For the Grapefruit Cake

  • 6 ounces (1 1/2 sticks) unsalted butter, at room temperature
  • 1 tablespoon fresh grapefruit zest
  • 3/4 cup granulated sugar
  • 1 1/2 cups grapefruit curd
  • 3 large eggs
  • 1 3/4 cup plus 1 tablespoon self-rising flour

Instructions

  1. To make the grapefruit curd, in a small saucepan, simmer grapefruit juice. Simmer and reduce from 1 cup to 1/2 cup. Remove from heat and allow to cool slightly.
  2. In a medium heatproof bowl (a metal bowl is best), stir together butter and granulated sugar until well incorporated and fluffy. I used a wooden spoon and some elbow grease. Using a whisk, add the egg yolks and whisk to combine. Add the eggs, one at a time, beating for one minute between each addition. Whisk in the salt and cloves and lemon juice. The mixture will seem slightly curdled. That’s ok. Slowly stream in and whisk the slightly cooled grapefruit juice until evenly combined.
  3. In a small or medium saucepan (I used the same saucepan I used to reduce the grapefruit juice), bring a few inches of water to a simmer. Place the heatproof bowl over the simmering water , making sure that the bottom of the bowl does not touch the simmering water.
  4. Whisk constantly. The sugar will begin to dissolve and the mixture will begin to thicken. This take between 8 and 10 minutes of near constant whisking. If you stop whisking, the eggs in the mixture may create lumps so keeeeeep whisking.
  5. Once thickened to the texture of warm pudding, remove the bowl from the simmering water and transfer to a small bowl. Allow to rest in the refrigerator while you make the cake.
  6. Place a rack in the center of the oven and preheat oven to 350 degrees F. Line the bottom of an 8-inch round baking pan with parchment paper, grease the pan and set aside.
  7. To make the cake, in the bowl of an electric stand mixer fitted with a paddle attachment, or in a large bowl with a set of hand beaters, beat together butter, sugar, and grapefruit zest until pale and fluffy, 3 to 5 minutes. Add half of the grapefruit curd and beat to combine. Add the eggs, one at a time, beating for 1 minute between each addition. Add the flour and use a wooden spoon to fold together until thoroughly combined.
  8. Spoon the batter into the prepared pan. Top with the remaining grapefruit curd and use a butterknife swirl the curd just slightly into the cake. Bake for 35 to 45 minutes until a skewer inserted in the center comes out with moist crumbs.
  9. Allow to cool for 15 minutes before transferring to a wire rack to cool completely.
  10. Serve in big wedges with warm tea.


Nutrition

  • Serving Size: 8

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Reader Interactions

Comments

  1. Omar

    February 28, 2016 at 8:39 pm

    Delicious! I had some lemon curd in the freezer (freezes beautifully!) and used Cara Cara orange for the zest. Loved it. I used the full tablespoon even though I know grapefruit zest is usually more mild. The curd sunk into the cake more than I would have hoped.. but, still a winner for me. Finally, I adore grapefruit flavored desserts.. but I had to use what I had.

    Reply
  2. Lilly

    February 21, 2016 at 3:08 pm

    I had made this cake yesterday, Feb20/16 hmmm… Following the recipe I only got 1 cup of curd and its dry

    Reply
    • joythebaker

      July 5, 2016 at 11:43 am

      Sounds like it might have been cooked for too long

      Reply
  3. Kate Ramos (@holajalapeno)

    February 15, 2016 at 11:18 am

    Wow! This cake sounds amazing. I love citrus desserts and this one sounds especially appealing!

    Reply
  4. Tricia

    February 14, 2016 at 4:17 pm

    I just made it using cara cara oranges and meyer lemon for the curd because that is the citrus I had on hand. YUM. I adore these kinds of cakes.

    Reply
  5. Dee

    February 14, 2016 at 3:21 pm

    Just made the cake today! Served it for dessert with some frozen yogurt on the side. Super delicous! A keeper.

    Reply
  6. Josephine

    February 10, 2016 at 1:36 am

    I made the cake this weekend and it was great! I had to get used to the zingy grapefruit taste in a cake, as I normally make sweets with nuts or chocolate, but it was light and fresh. It was shared with family and everyone was quite surprised that the grapefruit flavor survived the oven. I wonder if the curd can be made with other fruit juices like berries.

    Reply
  7. ennylaw

    February 9, 2016 at 6:19 pm

    It seems so easy to make it, right?

    Reply
  8. Leilayni

    February 9, 2016 at 4:04 pm

    I just made this cake. Wow! I did end up having to bake it an extra 10 minutes. Totally worth it.

    Reply
  9. Sarah

    February 9, 2016 at 11:40 am

    I enjoy your narrative, Joy! The pictures and delicious food are bonus.

    Reply
  10. Pat Barford

    February 7, 2016 at 8:00 pm

    Made and eating now as we watch the Super Bowl. A hit with the fam. And it came out exactly like in the photos. A keeper.

    Reply
  11. Mary

    February 6, 2016 at 5:49 pm

    I am absolutely going to make this. (Hiding the necessary grapefruit now!) I will never have an avocado or a grapefruit tree, but a person can dream of such things when there is two feet of snow between her and her garden :)

    Reply
  12. sweetteasweetie (@SweetTSweetie)

    February 5, 2016 at 5:35 pm

    This looks so delicious! What a great way to include grapefruit!
    Kari
    http://www.sweetteasweetie.com

    Reply
  13. Jen

    February 5, 2016 at 3:49 pm

    My parent’s backyard in LA has a huge avocado tree that fruits like crazy (so many that we leave a portion out for the squirrels). It’s one of the things I miss the most about living in SoCal – it was so painful to see avocados going for $3 each when I first moved to Seattle! Now I leave space in my suitcase for them when I go home :)

    Reply
  14. Cheri

    February 5, 2016 at 1:45 pm

    Butter measurement is wrong, 1 stick is 8 oz

    Reply
    • joythebaker

      February 6, 2016 at 4:13 pm

      1 stick is 4 ounces or 8 tablespoons.

      Reply
  15. Cecile

    February 5, 2016 at 1:23 pm

    This is such an interesting and – I’m POSITIVE – delicious cake! I just adore lemon curd and love the idea of making grapefruit curd from scratch. I award you the BIG GOLD METAL for this cake!! ; o )

    Reply
    • Cecile

      February 5, 2016 at 8:12 pm

      OOPS – Gold ‘Medal’ !! LOL

      Reply
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