Sunday, June 16, 2024
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Vegan Lemon Lime Cake – Gretchen’s Vegan Bakery

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


Lemon Lime Cake

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These are the products I used for this decoration:




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 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!

Yield: serves 12-14ppl

Lemon Lime Cake

Lemon Lime Cake

Prep Time
4 hours

Cook Time
25 minutes

Total Time
4 hours 25 minutes


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)
  • 1 Recipe Royal Icing for the mushrooms


  1. 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
  2. Or watch the YouTube video for how to make easy 2 ingredient mushrooms for decor
  3. First prepare your cake recipes and bake the batter into 7″ cake pans that have been greased & parchment lined
  4. 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
  5. 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
  6. Prepare the 2-2-2 Cream Cheese icing as per the instructions on that recipe post
  7. Once your cakes and the 2-2-2 Icing is prepared you can make the key lime custard and start to build the cake
  8. For the custard combine the water with the cornstarch & whisk smooth
  9. 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
  10. 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!


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




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