These Grapefruit Marshmallows are soft and plush, with a strong, tangy grapefruit flavor. You will be shocked by how much better homemade marshmallows taste than store bought!

Grapefruit Marshmallows |
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I’m back! I know, you probably didn’t miss me (…or notice I was gone? Sniff) but I missed you! Our friendship is unequal like that, and I don’t mind. Last week I took a mini blogging break and visited a friend in San Francisco, read a book, ate all the things, and remembered why I love sleep so much. It was fantastic.

The best part, though is that I came back totally recharged and ready to jump back into the kitchen! Last week I attempted a version of these grapefruit marshmallows (one of several kitchen failures) and they were so disappointing. The texture was great, but the grapefruit flavor was so light, it was practically absent. They tasted like bland sugar, mediocrity, and broken dreams. I wanted my marshmallows to have the distinct sweet-tart taste of a fresh ruby red grapefruit, and those sad little squares were not cutting it.

Grapefruit Marshmallows |

So this week brought attempt #2, and this time the marshmallows turned out perfectly. My big change was to reduce the grapefruit juice used in the recipe. I boiled it down until it was half of its original volume, yielding a sticky, potent syrup that condensed the essence of grapefruit into one small but powerful package. I also added a bit of fresh grapefruit zest, and a pinch of citric acid to boost the sour factor. (Optional but lovely!) This batch of marshmallows is wonderful—pillowy, soft, with a sour citrus tang tempered by a bit of sweetness.

Are you craving all things grapefruit now? You won’t want to miss my Grapefruit Meringue Pie, Pink Grapefruit Cake or Grapefruit Layer Cake!

Grapefruit Marshmallows |

These marshmallows are so good and addicting on their own, I considered leaving them plain for the blog post. I also flirted with the idea of toasting them and making some kind of citrus-white chocolate s’more, which is probably going to happen in my kitchen in about 2 minutes now that I’ve typed it out. But in the end, I decided to pair marshmallows with their natural soulmate, chocolate.

Grapefruit Marshmallows |

Why chocolate-covered marshmallows? There are few things more perfect than biting through a crisp semi-sweet chocolate shell and finding a soft, puffy marshmallow inside. The bitterness of the chocolate and the sour marshmallow somehow work together to make this candy sweeter than either element would be on its own. And finally, flowery prose aside, big squares of chocolate-dipped marshmallow just look rad with a few decorative garnishes arranged on top!

Grapefruit Marshmallows |

I finished these beauties with a sliver of candied grapefruit rind (homemade) a bit of candied ginger (storebought) and a sprig of sugared rosemary (also homemade). I’d considered adding some candied ginger or powdered ginger to the marshmallow itself, but ginger can be such an overpowering flavor, I think the hint of it on top of the marshmallow is the perfect amount. I got the idea to add rosemary after a back and forth with Stella from Bravetart on Twitter, and it added a lovely woodsy, herbal undertone. You are, of course, free to omit any or all of the garnishes, and top your chocolate-covered marshmallows with sprinkles, nuts, coconut, or nothing at all!

Grapefruit Marshmallows |

If you’ve never made homemade marshmallows before, you are going to be shocked at how different—and how much better—they are from their storebought cousins, and you might also be a little mad you’ve been wasting your time with the packaged kind for all of these years. Release the anger, move on, and be glad that you now have fluffy, sweet-tart grapefruit marshmallows in your life.

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These Grapefruit Curd Tarts have a grapefruit curd poured into mini tarts and are topped with fresh mint whipped cream and a scattering of edible flower petals…the interplay between the flavors is amazing!
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Grapefruit Layer Cake

This cheerful Grapefruit Layer Cake is sure to brighten your day! With moist grapefruit cake, a grapefruit curd filling, and grapefruit buttercream on the outside, it's wonderfully refreshing and such a nice change from the usual lemon or orange cakes. 
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Grapefruit Marshmallows on a wooden surface next to rosemary.

Grapefruit Marshmallows

5 from 1 vote
If you’ve never made homemade marshmallows before, you will be shocked how much better they are than store bought. These Grapefruit Marshmallows are soft and plush, with a strong, tangy grapefruit flavor. 
Prep30 minutes
Cook20 minutes
Total50 minutes


Optional Garnishes

  • Candied grapefruit rind, or other candied citrus rind
  • Candied ginger
  • Sugared rosemary, see Note below
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  • Spray a 9×13-inch pan lightly with nonstick spray, and press cling wrap into the pan, overlapping two sheets if necessary so that the bottom and sides of the pan are covered. Smooth the cling wrap down, then spray it with a light coating of nonstick spray. Set aside for now.
  • Pour the grapefruit juice into a small saucepan and place it over medium heat. Bring it to a boil and let it slowly bubble until it is reduced by half and you have 1/2 cup of grapefruit juice. This might take 10-20 minutes, depending on your stove and pan.
  • While you wait for the grapefruit juice to reduce, combine 3/4 cup of water and the powdered gelatin in a bowl and whisk them together. Set them aside so the gelatin can bloom. Pour the room temperature egg whites into the clean bowl of a large stand mixer fitted with the whisk attachment.
  • When your grapefruit juice is reduced to 1/2 cup, combine it with the remaining 1/4 cup water, the sugar, the corn syrup, and the salt in a medium saucepan. It will bubble quite a bit as it cooks, so make sure the pan you choose will let it triple in size. Place the pan over medium heat. Stir until the sugar is completely dissolved and the mixture comes to a boil, then stop stirring and insert a candy thermometer.
  • Continue boiling until the mixture reaches 260 degrees F.This process will take awhile, so move on to the next steps while the sugar syrup cooks, but be sure to check the sugar syrup frequently so that it does not go above 260 degrees.
  • Microwave the gelatin for 25 seconds, until it liquefies. When the sugar syrup nears 245 degrees, begin to beat the egg whites on medium-high speed. Beat them until they hold firm peaks, but do not overbeat or they will be crumbly. If the egg whites are ready before the sugar syrup reaches the correct temperature, stop the mixer until the sugar syrup is ready.
  • When the sugar syrup is at 260 F, carefully whisk the liquefied gelatin into the sugar syrup. Turn the mixer to low, and gradually pour the sugar syrup into the beaten egg whites in a thin stream. If your saucepan has a spout you can pour it from the saucepan, but if it does not, I recommend pouring the syrup into a large measuring cup or pitcher so that it is easier to pour. The sugar syrup is very hot and it can cause painful burns if it accidentally spills or splatters.
  • Gradually increase the speed until the mixer is running on high, and beat until the marshmallow mixture is shiny, thick, holds its shape, and is completely opaque, about 10 minutes. If you want to intensify the color, add a drop or two of pink and orange food coloring. Finally, add the grapefruit zest and citric acid, and gently stir them in by hand.
  • Pour the marshmallow mixture into the prepared pan and smooth the top flat with an offset spatula. Let the marshmallow set overnight, uncovered, at room temperature. Once the marshmallow has set, dust your workstation with a generous layer of powdered sugar, and dust the top of the marshmallow with more sugar.
  • Lift the marshmallow from the pan using the plastic wrap as a handle, and flip it facedown on the prepared surface. Peel the plastic off the top of the marshmallow, and dust the top of the candy with more sugar. Cut the marshmallow into small squares using a sharp chef’s knife.
  • If desired, melt or temper the chocolate. (I recommend tempering—see why, and learn how, at this blog post.) Dip the marshmallows into the chocolate, and while it’s still wet, top them with your decorations of choice.
  • Undipped marshmallows are best soon after they are made, but if your environment is not too humid, you can store them up to a week in an airtight container at room temperature. You may need to roll them in powdered sugar again before serving. Chocolate-dipped marshmallows will last a little longer and are good for up to two weeks.

Recipe Notes

Citric acid is optional, but it adds a nice tart flavor to these marshmallows. It can be purchased online or is often found in cake and candy supply stores, or in the bulk spices or canning section of some supermarkets.
To make sugared rosemary, beat 1 egg white with a teaspoon of sugar. Cut your rosemary into small sprigs, and dip them in the egg white, then dip them in granulated sugar. Let them dry before using them.

Measuring Tips

Our recipes are developed using weight measurements, and we highly recommend using a kitchen scale for baking whenever possible. However, if you prefer to use cups, volume measurements are provided as well. PLEASE NOTE: the adage “8 oz = 1 cup” is NOT true when speaking about weight, so don’t be concerned if the measurements don’t fit this formula.

Want to learn more about baking measurements and conversion?


Calories: 36kcal | Carbohydrates: 8g | Protein: 0g | Fat: 0g | Saturated Fat: 0g | Cholesterol: 0mg | Sodium: 14mg | Potassium: 9mg | Fiber: 0g | Sugar: 8g | Vitamin C: 1.4mg | Calcium: 1mg | Iron: 0mg
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Meet Elizabeth!

Hi, I’m Elizabeth — a trained pastry chef, cookbook author, video instructor, and your new Baking BFF! I’m going to teach you everything you need to know to be a sugar hero. ❤️

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  1. You definitely win the award for fanciest marshmallows ever. And I totally noticed your absence and missed your posts!

    1. Thanks Natasha! I’ve missed catching up on my friend’s blogs too–can’t wait to see what shenanigans you’ve been up to. 🙂

  2. Ummm, wrong. I missed you and totally noticed that you were gone! But I can’t even tell you how excited I was when I came over just now. Both that you are back and created a fabulous recipe!! I’ve never made marshmallows before and always wanted to and now that you’ve added such a great flavor and covered them in chocolate. I can’t wait much longer. Looks ah-mazing. Pinning now!!

  3. As of late I have been MAJORLY craving all things grapefruit…so I need this in my life right now. I still need to attempt making marshmallows at home, but when I do you can guarantee it’ll be these little beauties! 🙂

  4. “They tasted like bland sugar, mediocrity, and broken dreams.”

    Hahaha, I know this feel all too well.

    The marshmallows look fantastic! The garnishes add a great touch, not just for presentation but for flavor I’m sure. Sugared rosemary?? Hells effing yeah!!

    I wish I wasn’t so lazy, I’d totally make these.

    1. Haha, enjoy the relaxation, and have your kids fetch you some snacks from the kitchen. No shame in that game. 😉

  5. I may have mentioned once or twice how much I love citrus. So. Just fyi, I’m totally stealing this idea. 😉

    And I love the garnishes you used. I usually just dip them in chocolate and call it a day.

    You know, I’ve never made the marshmallows with egg whites before. How do you find they compare to the sugar-only versions? I’m assuming you’ve made the sugar-only ones – you’ve made everything, right??

    1. Steal it, Laurel! I only ask a 50% share of any profits. 🙂

      Good question about the marshmallow differences! It sort of depends on the individual recipe, but in general I find that the ones with egg whites are lighter and fluffier, while the gelatin-only ones are a bit denser and chewier. I also think the gelatin-only ones handle inclusions a little better, so I tend to use those if I want to add a lot of fruit puree or other mix-ins. Plus they’re a little easier to make, no futzing with egg whites! But if I had to pick only one I’d stick with whites, because the texture is so lovely.

      ….and there’s a novel about marshmallows! Hope that helps a bit. 🙂

      1. But if I eat them all, there won’t be any profits… Oops.

        And now you’ve convinced me to try the egg white ones. You’re right, the reason I haven’t tried them is that the gelatin version is more straightforward. But they sound awfully tempting.

  6. Hi – I was wondering – from your experimentation – would you say instead of replacing one of the waters ( either the blooming water or the sugar syrup water )with 100% juice (any kind) – you should instead always use part water and part ‘reduced ‘ juice instead? Also – is there an advantage to using the juice in the sugar syrup vs using it in the bloom liquid? Thx!

    1. Hi! Replacing either with juice should work just fine, it doesn’t matter which! I haven’t tried it myself, but there’s no reason it shouldn’t work. Let me know how it goes for you!

    1. Hi Alexis! I have not tried using agar agar so I’m not sure how well it would work. Come back and let us know how it goes!