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Gluten-Free RHUBARB Cake With Polenta (vegan)

Modified: Jun 13, 2025 · Published: May 6, 2017

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A big hello to a gluten-free rhubarb cake with almonds and polenta that’s moist, dense, slightly rustic, and packed with delicious spice. No flour, eggs, or dairy needed for this little wholesome masterpiece.

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In This Post:
  • What Goes Into This Gluten-Free Rhubarb Cake
  • Baking (And Savoring) Tips
  • 🍽 Recipe
  • More Gluten-Free Rhubarb Recipes

I’ll say it like it is: This isn’t your typical light and fluffy cake.

This is a satisfying, wholesome treat. Here’s why:

  • All the good stuff—almonds, flax seeds, polenta, bananas, and of course, rhubarb.
  • A lovely combo of textures and flavors: the moist, slightly dense base perfectly complementing the tartness of the rhubarb and the nutty notes of almonds and polenta.
  • It’s wholesome. It’s nourishing. And above all, it’s just really, really good.

And to make it a tiny bit fancy, we’re adding a touch of orange zest and vanilla. Welcome to spice-filled, gluten-free rhubarb cake heaven!

gluten-free rhubarb cake with almonds and polenta

What Goes Into This Gluten-Free Rhubarb Cake

It might look like a long list, but chances are you already have most of these in your pantry—or they’re easy to pick up.

  • Ground almonds: The secret to keeping it flourless, moist, and a little nutty.
  • Polenta: For body and texture.
  • Bananas: Ripe and sweet, they’re the natural binder, plus they bring in some sweetness.
  • Sugar, of course: Just enough to keep things sweet without being over the top.
  • Ground flaxseed: The egg replacer.
  • Vegan yogurt: Makes the cake extra soft and moist.
  • Neutral oil: Keeps it light and tender.
  • Almond butter (optional): A little extra richness, but you can skip it if you don't have almond butter.
  • Orange zest: Because rhubarb + citrus = a match made in cake heaven.
  • Ground vanilla (or vanilla extract): Just a little hint to round out the flavors.
  • Baking powder: For a perfect rise.
  • Rhubarb: Tangy, juicy, the star of the show.

Baking (And Savoring) Tips

This recipe makes a cute little 20 cm (8-inch) round cake.

And yes, it’s lovely when it’s fresh out of the oven—warm and soft. It might be a bit crumbly at first, but it firms up as it cools.

If you’re in the mood to add something extra, I’d suggest a sprinkle of powdered sugar, a scoop of vanilla ice cream, or a dollop of whipped cream.

Pro tip: Let it sit for a day or two if you can. The flavors get even better when they have time to mingle and chat (just like in a good old bundt cake).

🍽 Recipe

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Gluten-Free Rhubarb Cake with Almonds and Polenta

This vegan, gluten-free rhubarb cake is rich, moist, and packed with flavor. It’s a sweet, spiced cake topped with tangy rhubarb pieces—a delicious balance of flavors!
Prep Time20 minutes mins
Cook Time1 hour hr
Course: Dessert
Cuisine: German
Keyword: easy, flourless, gluten-free, plant-based, rhubarb, spring

Equipment

  • 1 Round cake tin or springform, 20 cm / 8 inches diameter

Ingredients

Metric - US Customary

Dry Ingredients

  • 150 g sugar (I used birch sugar, but caster or brown sugar also works)
  • 2 teaspoons ground flaxseed (acts as an egg replacer)
  • 200 g ground almonds
  • 180 g polenta
  • 2 teaspoons baking powder
  • 1 teaspoon vanilla powder (or 2 teaspoons of vanilla extract)

Wet Ingredients

  • 2 large ripe bananas
  • 150 ml neutral oil (I used rapeseed oil)
  • 50 ml water
  • 100 ml plain vegan yogurt
  • 3 tablespoons almond butter (optional, adds richness and a slightly lighter texture)
  • Zest of 1 large orange or 2 small ones (zest only)

Topping

  • 300 g rhubarb

Instructions

  • Heat your oven to 160° C (320° F).
  • In a large mixing bowl, combine the dry ingredients (sugar, ground flaxseed, ground almonds, polenta, baking powder, and vanilla powder).
  • Peel and mash the bananas in a separate bowl until smooth.
    Add the oil, water, yogurt, almond butter (if using), and orange zest. Mix well.
  • Pour the wet ingredients into the bowl with the dry ingredients. Mix until just combined.
  • Line the base and sides of your cake tin or springform with parchment paper or grease the sides with oil.
    Pour the batter into the prepared tin and spread it out evenly.
  • Wash the rhubarb and trim the ends (no need to peel it).
    Cut into 1.2–1.6 inch (3–4 cm) pieces.
  • Arrange the rhubarb pieces on top of the batter, pressing them gently halfway into the mixture.
  • Place the cake on the middle rack and bake for about 60 minutes or until the top is golden brown and a toothpick comes out clean.
  • Let the cake cool in the tin for 10–15 minutes before carefully removing it, as it might be crumbly when warm.
    Enjoy a slice while it’s still slightly warm, or let it sit for a day or two—just like a bundt cake, the flavors get even better!

I’m always curious. How did it go? Tried this gluten-free rhubarb cake recipe? I wanna hear all about it. How did you serve it? Any fun twists? Any flops? Drop the details below because we all love a good kitchen win or a lesson learned.

Wishing you planty of springy rhubarb delights,
Ramona

♥

More Gluten-Free Rhubarb Recipes

  • Virgin Rhubarb Piña Colada - The Perfect Spring Cocktail! (Vegan)
  • Tropical Stewed RHUBARB Recipe (vegan)

More Food

  • Savory Garlicky WATERMELON Rind Spread (Yes, Really!)
  • The Best Vegan MAYO Recipe (A Classic)
  • Vegan RHUBARB Cake With Streusel and Pudding
  • Elderflower SYRUP: Bottled Bloom Essence (So Easy!)

Reader Interactions

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  1. Anja says

    June 08, 2017 at 9:38 pm

    Dear Ramona, I tried your rhubarb cake (to fight the monstrous rhubarb in my garden) and it is really delicious! And no baking desaster as usual, that means, it is really easy to make (even for non-bakers like me...).
    As there was no birch sugar in my cupboard, I used normal sugar 1:1 and it worked as well. As there was no almond butter, too, I replaced it with hazelnut butter - also great and really flavorful! And a little bit of cinnamon also hit the bowl... thats my baking and the reason why things always go wrong - but not with this cake! 🙂
    Thanks for sharing and now I'm prepared for gluten sensitive visitors the next time.

    Reply
    • Ramona says

      June 10, 2017 at 4:51 pm

      Dear Anja,
      Thanks a lot for taking the time to write a comment, and many thanks also for trying out my recipe. I'm so happy that it was easy to make and that the cake turned out delicious. 🙂
      Perfect that you substituted birch sugar 1:1 for regular sugar, as birch sugar has the same sweetening capacity as regular sugar.
      Good idea to add some cinnamon, I can imagine that it went well with the orange zest and the rhubarb.

      Reply

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