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Home » Recipes » Baking & Desserts

Gluten-Free Vegan Lemon Poppy Seed Cake

Modified: Aug 22, 2025 · Published: Jan 22, 2020 by Rhian Williams

Photo of the author Rhian Williams
Modified: Aug 22, 2025 · Published: Jan 22, 2020 by Rhian Williams · This post may contain affiliate links · 109 Comments
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A collage of two Gluten-Free Vegan Lemon Poppy Seed Cake photos

This Gluten-Free Vegan Lemon Poppy Seed Cake is moist and fluffy, sweet and tangy and a little nutty from the poppy seeds! It's also covered in a rich, lemony frosting. It's easy to make as it comes together in one bowl, and is easily customisable too. It's also refined sugar free, and is great for birthdays, Easter, Mother's Day and baby showers!

Gluten-free vegan lemon poppy seed cake topped with frosting, lemon zest and poppy seeds with two slices next to it

As my Lemon Drizzle Cake is one of the most popular baking recipes I've posted, I decided to make more lemon dessert recipes, and this Gluten-Free Vegan Lemon Poppy Seed Cake is the answer!

How to make the cake

Scroll to the bottom of the post for the full recipe.

  • Mix together the ingredients for the cake in a glass mixing bowl.

Tip: Use a measuring jug to measure out the plant-based milk.

Gluten-free vegan lemon poppy seed cake batter in a mixing bowl
  • Transfer the cake batter into a one-pound loaf tin.

Tip: Make sure to line the loaf tin with greased baking paper - this will make removing the cake from the tin so much easier!

Gluten-free vegan lemon poppy seed cake batter in a loaf tin lined with baking paper
  • Bake in the oven for 45 minutes.
Gluten-free vegan lemon poppy seed cake in a loaf tin lined with baking paper
  • Transfer to a cooling rack to cool down before applying the frosting.
Gluten-free vegan lemon poppy seed cake loaf on a wire rack

For the frosting

  • Place the ingredients for the frosting in a food processor or blender.
Cashew nuts, lemon juice and maple syrup in a food processor
  • Whizz until completely smooth, adding some plant-based milk or water to thin out if necessary.
Vegan lemon frosting in a food processor
  • Use a knife (or palette knife for frosting) to spread the frosting over the top of the loaf.
Gluten-free vegan lemon poppy seed cake loaf topped with vegan lemon frosting on a wire rack

How to decorate

I decided to decorate this cake with lemon zest and poppy seeds, but you can use whatever you like!

Gluten-free vegan lemon poppy seed cake loaf topped with vegan lemon frosting, lemon zest and poppy seeds on a wire rack

Substitutions you can make

  • You can use any type of oil: coconut oil, vegetable oil, olive oil etc.
  • You can use any type of liquid sweetener: maple syrup, agave syrup, brown rice syrup etc.
  • You can use any type of plant-based milk: almond milk, oat milk, soy milk, cashew milk, rice milk etc.
  • If you don't need the cake to be gluten-free, you can replace the gluten-free flour with plain flour.
  • The ground almonds can be replaced with ground walnuts.
  • For a nut-free version, use ground sunflower seeds instead of ground almonds, use a nut-free plant-based milk and omit the frosting or make a different frosting.

Tips for baking with lemons

  • For optimum lemon flavour, I would recommend using fresh lemons (not ones that you've had sitting in your fruit bowl for weeks!) and organic ones if possible.
  • You have to be careful when baking with lemon juice as the acidity and lemon flavour can really vary depending on the lemons you use.
  • I would recommend tasting the lemon juice you're using and adjusting the amount of lemon juice you use accordingly.
  • For the lemon zest, make sure you use unwaxed lemons.

How long does this Lemon Poppy Seed Cake keep for?

This Lemon Poppy Seed Cake tasted best eaten on the day it was made, but keeps covered in the fridge for up to a few days. 

Gluten-free vegan lemon poppy seed cake loaf topped with frosting, lemon zest and poppy seeds with two slices next to it

More vegan lemon cakes

  • White Chocolate Lemon Cake
  • Lemon Blueberry Mug Cake
  • Lemon Drizzle Cake
  • Lemon Blueberry Cake
  • Lemon Poppy Seed Bread
  • Lemon Poppy Seed Layer Cake

If you try out this recipe or anything else from my blog, I'd really love to hear any feedback! Please give it a rating, leave a comment, or tag a photo @rhiansrecipes #rhiansrecipes on Instagram! Thank you.

Watch how to make this recipe

Gluten-free vegan lemon poppy seed cake topped with frosting, lemon zest and poppy seeds with two slices next to it

Gluten-Free Vegan Lemon Poppy Seed Cake

This Gluten-Free Vegan Lemon Poppy Seed Cake is moist and fluffy, sweet and tangy and a little nutty from the poppy seeds! It's also covered in a rich, lemony frosting. 
4.19 from 85 votes
Print Pin Rate
Course: Dessert
Cuisine: American
Keyword: gluten-free lemon poppy seed cake, gluten-free vegan cake, vegan lemon poppy seed cake
Prep Time: 25 minutes minutes
Cook Time: 45 minutes minutes
Total Time: 1 hour hour 10 minutes minutes
Servings: 10 slices
Calories: 356kcal
Author: Rhian Williams
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Ingredients

For the cake:

  • 60 g (¼ cup) coconut oil (or sub olive or vegetable oil)
  • 180 ml (¾ cup) unsweetened almond milk (or any other plant-based milk)
  • 8 tablespoons lemon juice
  • 2 tablespoons lemon zest (use unwaxed lemons)
  • 12 tablespoons maple syrup (or sub any other sweetener)
  • 1 teaspoon vanilla extract
  • Pinch salt
  • 3 tablespoons poppy seeds
  • 150 g (1 ¼ cup) ground almonds (almond meal) *
  • 150 g (1 ¼ cup) gluten-free flour blend (or sub plain flour if not gluten-free)
  • 2 heaped teaspoons baking powder (ensure gluten-free if necessary)
  • ¼ teaspoon bicarbonate of soda (baking soda)

For the frosting:

  • 100 g (⅔ cup) raw cashew nuts soaked in cold water overnight or in hot water for 15 minutes
  • 6 tablespoons maple syrup (or sub any other sweetener)
  • 4 tablespoons lemon juice

To decorate (optional):

  • Lemon zest
  • Poppy seeds

Instructions

For the cake:

  • Preheat oven to 180 degrees Celsius (350 degrees Fahrenheit).
  • Place the coconut oil in a large bowl and melt over a saucepan of boiling water or in the microwave (skip this step if using any other oil).
  • Once melted, add the milk to the same bowl along with the lemon juice, lemon zest, maple syrup, vanilla, salt, poppy seeds and ground almonds.
  • Sift in the flour, baking powder and bicarbonate of soda.
  • Mix well, adding a tiny splash more milk if it's looking too dry.
  • Transfer mixture into a loaf tin lined with greased baking paper (I used a one-pound loaf tin).
  • Bake in oven for 45 minutes until risen and golden brown and an inserted skewer comes out clean.
  • Once out the oven, transfer the cake from the baking tin onto a wired rack to leave it to cool completely before applying the frosting.

For the frosting:

  • Drain the soaked cashews and add to a food processor or blender with the maple syrup and lemon juice.
  • Whizz until completely smooth, adding some plant-based milk or water to thin out if necessary.

To frost and decorate the cake:

  • Use a knife (or palette knife) to spread frosting over the top of the loaf.
  • Decorate with lemon zest and poppy seeds, if desired.
  • This cake tasted best eaten on the day it was made, but keeps covered in the fridge for up to a few days.

Video

Notes

*You can alternatively use almond flour.
Tips for baking with lemons
  • For optimum lemon flavour, I would recommend using fresh lemons (not ones that you've had sitting in your fruit bowl for weeks!) and organic ones if possible.
  • You have to be careful when baking with lemon juice as the acidity and lemon flavour can really vary depending on the lemons you use.
  • I would recommend tasting the lemon juice you're using and adjusting the amount of lemon juice you use accordingly.
  • For the lemon zest, make sure you use unwaxed lemons.
Nutrition Facts
Gluten-Free Vegan Lemon Poppy Seed Cake
Amount Per Serving
Calories 356 Calories from Fat 180
% Daily Value*
Fat 20g31%
Saturated Fat 7g35%
Sodium 56mg2%
Potassium 205mg6%
Carbohydrates 42g14%
Fiber 4g16%
Sugar 24g27%
Protein 7g14%
Vitamin C 9mg11%
Calcium 154mg15%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.
Made the recipe?Tag @rhiansrecipes on instagram and use the hashtag #rhiansrecipes!

Disclosure: This posts contains affiliate links to Amazon. If you purchase any of these products, a small percentage will come to me with no extra cost to you! This income will go towards the running of this blog - thank you.

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Comments

    4.19 from 85 votes (68 ratings without comment)

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    Recipe Rating




  1. Cindy Johnson

    April 29, 2022 at 3:31 am

    I had a craving for cake and this was the recipe I tried. I'm so glad I did!! It was delicious - the tang of lemon and the quiet sweetness of maple syrup made it so satisfying. Knowing that the ingredients are healthy options, just made it even more tasty! I used almond meal that was left from making almond milk.

    Reply
    • Rhian Williams

      April 29, 2022 at 11:11 am

      Thank you so much, so happy to hear that!

  2. Jim

    February 24, 2023 at 8:19 pm

    You mentioned "Sift in the flour" in step 4. Should the flour be measured by sifting or just scooping it out into a measuring cup then sifted in to the mixture? Measuring the flour by just spooning it in or pouring it in the measuring cup is more "packed" and will measure differently than sifting, is why I ask. Thanks! 🙂

    Reply
    • Rhian Williams

      February 25, 2023 at 2:21 am

      Hi, you can measure the flour before sifting! I hope that helps!

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Hi, I’m Rhian! I make easy, undetectably vegan + gluten-free recipes, including healthy comfort food and naturally sweetened desserts using plant-based ingredients.

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