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Vegan Lemon Lime Cake

March 10, 2025 By Gretchen

Jump to Recipe Jump to Video Print Recipe

Saint Patrick’s Day brings on all the green food!

Vegan Lemon Lime Cake is a perfect way to celebrate the green!

Lemon Lime Cake

 

Layers of dense lemon pound cake and fluffy key lime cake

With key lime custard and lemon cream cheese icing!
This is one giant building on recipes project but it is totally worth it!

Lemon Lime Cake

Mossy cake crumbs and royal icing mushrooms and don’t forget the pot of gold!

Lemon Lime Cake

Of course Lemon Lime Cake is not just for Saint Patrick’s Day

Since this cake (minus all the decor) turns into a simple but luscious Lemon Lime Crunch Cake!
Yep I’m obsessed with crunch cakes and this one made from the extra lemon cake layer is total perfection!

Lemon Lime Cake

CLICK HERE FOR THE YOUTUBE VIDEO TUTORIAL FOR HOW TO MAKE THIS CAKE

Lemon Lime Cake

This website may contain links as part of the Amazon Affiliate program, which means when you click a link and make a purchase through my website I may earn a small commission at no additional cost to you
These are the products I used for this decoration:

GOLD LEAF

GOLD SPRINKLES

CHOCOLATE CAULDRON MOLD

Non Tempering Chocolate

Notes for Success:

You do not have to make both cake recipes if you want to keep it simple just opt for one of the recipes of your choosing
New lemon cake recipe linked below in the recipe section is my improved and updated “easy lemon cake recipe” that I would recommend
The original lemon cake recipe is a bit finicky and can be tricky if you do not have a high speed whip attachment and a stand mixer

Cornstarch is a very difficult ingredient to measure consistently with a volume/spoons measure
So while I list both measures for the custard recipe below I cannot stress enough how the grams measure with a scale is going to give you the best results.
Many times people have complained that their custard is like rubber and they don’t know why!

Lemon Lime Cake

Lemon Lime Cake

Print Recipe Pin Recipe
Prep Time 4 hours hrs
Cook Time 25 minutes mins
Total Time 4 hours hrs 25 minutes mins

Ingredients
  

  • 1 Recipe Key Lime Cake
  • 1 Recipe Lemon Cake
  • 1 Recipe 2-2-2 Cream Cheese Icing

For the Key Lime Custard

  • Sweetened Condensed Milk 2 ~ 11oz cans 660g
  • Plant Milk 12 Tablespoons 180ml
  • Key Lime Juice 1 cup 240ml
  • Water 8 Tablespoons 118ml
  • Vegan Butter 2 Tablespoon 28g
  • Cornstarch 7 Tablespoons 56g

for the decorations

  • 1 Recipe Royal Icing for the mushrooms

Instructions
 

  • If you are making the mushrooms decor you must prepare the royal icing decor at least 3 days in advance so they have time to dry properly so you can brush them with color & chocolate
  • Or watch the YouTube video for how to make easy 2 ingredient mushrooms for decor
  • First prepare your cake recipes and bake the batter into 7" cake pans that have been greased & parchment lined
  • You can prepare the cake recipes up to 2 days in advance & keep them refrigerated wrapped well until you are ready to build the cake
  • You will take one of the lemon cake layers and crumble it up to large crumbs, add food color and toast it to crunchy coating in the oven at 350°F for approximately 20 minutes
  • Prepare the 2-2-2 Cream Cheese icing as per the instructions on that recipe post
  • Once your cakes and the 2-2-2 Icing is prepared you can make the key lime custard and start to build the cake
  • For the custard combine the water with the cornstarch & whisk smooth
  • Next combine all the ingredients including the cornstarch slurry, (but not the vegan butter) together in a medium sauce pot and bring to a boil while whisking constantly
  • Once the custard boils and is visibly getting thicker, add the vegan butter and whisk smooth, cool slightly before adding as the filling to your cake or you will melt your buttercream rim!

Video

Notes

Lemon Lime Cake should be kept refrigerated sue to the key lime custard filling, but it will be safe at room temperature for up to 4 hours.
Refrigerate for up to 1 week, but for best taste bring to room temperature before serving
Tried this recipe?Let us know how it was!

 

Filed Under: All Recipes, Cake Decorating, Cake Recipes, Holiday Baking, Layer Cakes

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Reader Interactions

Comments

  1. Gerard

    March 4, 2023 at 10:38 am

    Hi Gretchen, just to let you know, it’s not possible to watch the YouTube video for the 2 ingredient mushrooms, as the video is set to private.

    The cake looks absolutely stunning!

    • Gretchen

      March 4, 2023 at 1:15 pm

      Hi Thanks! Yes the video just went live to YouTube now and the video for this actual LEMON LIME CAKE will be ready in a few days! I’ve been really backed up & backwards with my editing schedule lately & I’ve been rolling out so many new recipes I just can’t keep up with all teh video editing!
      Here is the link for the mushrooms video! https://youtu.be/CRnYoFakOuE

  2. Bobette

    March 6, 2023 at 7:13 pm

    I realize your recipes are vegan; but I love the looks of your cakes. My question is can I use real butter, oil or Crisco in this recipe? I could never duplicate your beautiful cake. but would love to try the9x13 pan. Thank you.

  3. Tatiana Diamond

    March 8, 2023 at 4:21 pm

    Gretchen, i love all your cakes since Day 1, can you please make a butterbeer cake? It is almost impossible to find a good vegan recipe for harry potter themed, but i was wondering if you had any ideas on how to make one. Thank you!!!

  4. Danielle

    February 19, 2024 at 10:37 pm

    Hi there! Excited to give this a go! Where can I find a recipe for the crunchy moss part?

    • Gretchen

      February 20, 2024 at 11:54 am

      Hey sorry I did not include that! I may have talked about it in the video though!
      It’s essentially just the trimmings from the lime cake with added food color to give it a forest green color~ I toast my cakes trimmings so they are crunchy
      So technically any vanilla cake would be fine & add color to make it the color green you like

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Yep, it's me Gretchen~ Owner of Gretchen's Bakery. Well, I no longer own a physical bakery since I sold mine in late 2014 & since 2016 I make nothing but the best vegan recipes! Read More…

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