Lemon Chocolate Cake

I told you I had big plans for this black cocoa cake and this is already recipe 5 I’m using it in? Of course, the OG with the espresso and mascarpone, then I used it in my chocolate s’mores cake, ice cream sandwiches, coffee Oreo ice cream sandwiches and up next is chocolate pistachio! 

I also have a lovely lemon curd cake that I think you will love!

Why you’ll love this Lemon Chocolate Cake

  1. The cake is so soft and fluffy and perfectly chocolatey…and might I add gorgeous? Some people are turned off by the black cake but I think it’s a stunner.
  2. The mascarpone cream is soooo light but just a little more full feeling than whipped cream. Lemon curd brings a nice sharp punch of lemon.  
  3. It’s the best of both worlds for all chocolate lovers and summer-y fruit-y cake vibes. 

Ingredients for Chocolate Lemon Cake

  • Flour: I use all purpose flour in most of my recipes BUT sometimes you just cannot beat the texture of cake flour. I highly recommend King Arthur’s Cake Flour. It is far superior to some alternatives in the grocery stores.
    • I have used the “homemade cake flour” trick by replacing 1 tablespoon of all-purpose flour with cornstarch. 
    • I HIGHLY recommend using a digital scale, as flour is so often over measured. 
  • Baking Powder: to leaven the cake. I haven’t tested this with baking soda but it should work fine with ½ tsp. 
  • Sugar: I used granulated sugar in the cake and I don’t recommend cutting any out as it contributes a lot to texture and it’s not overly sweet… it’s actually not very sweet at all (even though it seems like a lot).
    • I also used powdered sugar in the frosting and don’t recommend cutting any out. 
  • Oil: I like oil in chocolate cake recipes – any neutral oil, like avocado, canola, etc. is fine. 
  • Eggs: I use large eggs, make sure they’re room temperature. If not, then just place it in a cup of hot water for 10 minutes before using it.  
  • Sour Cream: I’ve used greek yogurt and sour cream in this recipe and they both work well. You can also use plain yogurt. 
  • Coffee: I use hot coffee in this recipe. I usually use Americanos but fresh brewed coffee is fine too. If you don’t want to use coffee, hot water will work as well, the flavor will just be a little less intense… The acid from the coffee also helps make it a little more tender and it’s not a noticeable coffee flavor so I do recommend the coffee. 
  • Mascarpone: I like the Belgioioso brand and make sure it’s cold when you’re whipping it. 
  • Whipped Cream: Make sure it’s whipping cream and use it cold when whipping. 
  • Vanilla: I used a little vanilla bean paste in the mascarpone cream but extract works too. 
  • LemonCurd: I used a store bought lemon curd – the bone maman brand is ok but the Dickinson’s brand is really good if you can find that.
    • I also have a homemade lemon curd if you want to make that – occasionally lemons can react with eggs or metals and result in a metallic taste which I can’t seem to get rid of sooo I used the store bought. 
  • Lemon: I used 1 large lemon to make a lemon simple syrup for the cake. 

Step-by-Step Instructions

Black Cake

  1. Whisk together the flour, cocoa powder, baking powder and salt until they’re evenly distributed.
  2. In a separate bowl, whisk the oil, sugar, eggs and sour cream until they’re well combined and smooth.
  3. Sift the dry ingredients over the wet and whisk just a little – about halfway. 
  4. Pour in the hot coffee and whisk until the batter is completely smooth.
  5. Scrape the edge of the bowl and give it a good mix. Pour into prepared cake tin(s). 
  6. Bake for 35ish minutes, until the tallest part of the cake, in the center, springs back when you press on it. If you’re hesitant, give it another minute or so.
  7. Let the cake rest for 10 minutes in the pan, then flip over onto a tea towel.
  8. Let the cake cool upside down for 30 minutes or so and then flip back over. 
  9. Once it’s cooled, slice the cake into two halves so you have a two layer cake.

Lemon Soak

  1. Combine the lemon zest with the lemon juice, sugar and water and stir over medium heat for a few minutes until the sugar dissolves. 
  2. Slice the cake in half and use the lemon syrup to soak the cake, I just drizzle it on to each cake (the side you sliced) with a spoon. 

Mascarpone Cream

  1. Beat together the cold mascarpone with the powdered sugar until it’s completely smooth.
  2. Add the vanilla bean paste and turn the mixer to medium speed. 
  3. Stream in the cold heavy whipping cream in 3-4 increments, stopping to scrape the edge of the bowl each time.
    1. Once all the heavy whipping cream is added, it may seem soft so turn the mixer up to full speed and it should thicken and hold peaks within a couple of minutes. Don’t over-beat once you’ve reached this stage.
  • Add the lemon curd and mix just until it’s combined. 
  • Spread half of the cream on top of the first layer of cake, top with a generous drizzle of lemon curd and repeat with the next layer. 

Expert tips on getting perfect chocolate lemon cake

  • Don’t swap ingredients unless I mentioned them in the ingredient section above.
  • Don’t reduce the sugar. I know a lot of people do that for some recipes but not this one.
  • Weigh your ingredients with a digital scale 
  • Weigh the batter for each cake tin to get even layers (if you’re using two pans). 

What sizes can I make this lemon chocolate cake 

Make sure to read my Black Cocoa Cake post for more details on how to adjust the cake to the different sizes but if you’re using just the recipe in the recipe card and not adjust that at all then you could get: 

  • Three (taller) or four (shorter) 6 inch cakes 
  • Two (average height) 8 inch cakes
  • Two (short) 9 inch cakes
  • One 10 inch cake
  • One 9×13” cake
  • 24 cupcakes 

If you’re making cupcakes, I put 50 grams in each cupcake tin and bake for about 18-20 minutes. You could skip the lemon syrup, fill the cupcakes with the lemon curd and top with the mascarpone cream. 

When baking, generally a thinner layer will get 20-25 minutes of baking and a thicker cake layer will get 30-40 minutes. 

Once it no longer looks wet, press on the center of the cake gently and it will spring back when it’s done baking. If it doesn’t spring back, give it another few minutes. 

Frequently Asked Questions

Can I use all-purpose flour?

I have used the “homemade cake flour” trick by replacing 1 tablespoon of all-purpose flour with cornstarch. The cake will work if you make them this way but they won’t be quite as soft and tender. 
I HIGHLY recommend using a digital scale, as flour is so often over measured. 

Can this be made dairy free?

You can definitely use a dairy free yogurt or sour cream, whatever you find. For the frosting, if there’s a dairy free mascarpone/cream cheese and heavy cream you like then go for it!

Can this be made gluten-free?

I haven’t tested it but pretty much all my other cakes work fine with a 1:1 substitute like Bob’s or King Arthurs so I don’t see why not.

Can I make this ahead of time?

This cake holds on to moisture really well so you can make it 1-2 days in advance before serving. I’m not going to lie, I kept mine in the fridge for over a week and it was still good. 

Do I have to use black cocoa powder?

I used black cocoa powder because this is my black cocoa cake and I love it but it should work just fine with regular cocoa powder. 

How do I know when it’s done baking?

Just like all the rest of my cakes, I test if it’s done baking by pressing gently on the tallest part of the cake. The cake will spring back if it’s done baking. If it stays indented, give it a few minutes in the oven, before testing again. 

How to store this lemon chocolate cake

If the cake is not frosted, keep it airtight at room temperature for a couple of days. If it’s frosted, store it airtight in the fridge for up to a week. 

I don’t like when things taste like “the fridge” lol so if you leave it uncovered it can get a weird fridge taste (maybe that’s just me?) so I recommend covering it but it’s hard to cover without messing up the frosting. A tall cake dome would work best if you have one. 

I just slice it and lay them in a large pan and cover the pan with plastic wrap. You can also freeze it like this.

Thanks so much for reading today’s post, if you have any questions just comment down below. If you make this fabulous chocolate lemon cake, I’d love it if you left a star rating or a review for me!

As always, have a blessed day and happy baking!

Love, B

three layer lemon chocolate cake

Lemon Chocolate Cake

Turned my FAVORITE black cocoa cake into a lemon chocolate cake with a layer of mascarpone lemon cream and lemon curd between the layers and on top of the cake! 
5 from 4 votes
Prep Time 20 minutes
Cook Time 35 minutes
1 hour
Total Time 1 hour 55 minutes
Course Cakes
Cuisine American
Servings 16 servings
Calories 509 kcal

Equipment

  • 1 large bowl
  • 1 stand mixer or hand mixer
  • 1 8×3 inch or 9 inch cake pan see blog post for other size options
  • 1 offset spatula
  • 1 large knife

Ingredients
  

Black Cocoa Cake

  • 240 grams (2 cups) cake flour
  • 80 grams (1 cup) black cocoa powder
  • 1/2 tsp fine sea salt
  • 14 grams (1 Tbsp) baking powder
  • 350 grams (1 3/4 cup) granulated sugar
  • 160 mL (2/3 cup) canola oil or any neutral oil
  • 2 large eggs room temperature
  • 150 grams (2/3 cup) sour cream
  • 240 mL (1 cup) hot coffee I use Americano

Lemon Syrup

  • 60 mL (1/4 cup/2 oz) water
  • 25 grams (2 Tbsp) granulated sugar
  • 1 large lemon – zest and juice

Lemon Cream

  • 227 grams (1 8oz tub) mascarpone cold
  • 120 grams (1 cup) powdered sugar
  • 360 mL (1 1/2 cups) heavy whipping cream cold
  • 12 ounces lemon curd I used a whole jar of Bone Maman*
  • 1 tsp vanilla bean paste
  • tiny pinch fine sea salt

Instructions
 

Black Cake

  • Preheat the oven to 350F (I use convection cuz my oven runs really hot at the bottom – conventional is also fine) and grease and line an 8×3 inch or two 8×2 inch baking pans with baking spray and parchment paper (I did one cake pan and sliced them into thirds but if you bake three layers, you'll get about 14-15 ounces in each).
  • In a large bowl, whisk together the flour, cocoa powder, baking powder and salt until they’re evenly distributed.
    240 grams (2 cups) cake flour, 80 grams (1 cup) black cocoa powder, 1/2 tsp fine sea salt, 14 grams (1 Tbsp) baking powder
  • In a separate large bowl, whisk the sugar, oil, eggs and sour cream until they’re well combined and smooth.
    350 grams (1 3/4 cup) granulated sugar, 160 mL (2/3 cup) canola oil, 2 large eggs, 150 grams (2/3 cup) sour cream
  • Sift the dry ingredients over the wet and whisk them together, just a little – about halfway or so.
  • Pour in the hot coffee and whisk until the batter is completely smooth and all the dry ingredients are combined.
    240 mL (1 cup) hot coffee
  • Scrape the edge of the bowl and give it a good mix. Pour into prepared cake tin(s).
  • Bake for 40ish minutes (or 15-20 minutes if baking three separate layers), until the tallest part of the cake, in the center, springs back when you press on it. If you’re hesitant, give it another minute or so.
  • Let the cake rest for 10 minutes in the pan, then flip over onto a tea towel and let the cake cool upside down for 30 minutes or so before flipping back over.
  • Once it's cooled, slice the cake in half.

Lemon Syrup

  • Mix together the water, sugar, lemon zest and juice in a small pot over medium heat for a few minutes, until the sugar is dissolved. Let it cool for a few minutes. Brush half of the syrup onto each cake (on the sliced side).
    25 grams (2 Tbsp) granulated sugar, 1 large lemon – zest and juice, 60 mL (1/4 cup/2 oz) water

Lemon Cream

  • In the bowl of a stand mixer (or a large bowl with a hand mixer), beat together the cold mascarpone with the powdered sugar until it’s completely smooth.
    227 grams (1 8oz tub) mascarpone, 120 grams (1 cup) powdered sugar
  • Add the vanilla bean paste and turn the mixer to medium speed.
  • Stream in the cold heavy whipping cream in 3-4 increments, stopping to scrape the edge of the bowl each time.
    360 mL (1 1/2 cups) heavy whipping cream
  • Once all the heavy whipping cream is added, it may seem soft so turn the mixer up to full speed and it should thicken and hold peaks within a couple of minutes. Don’t over-beat once you’ve reached this stage.
  • Add half of the lemon curd, salt and vanilla and mix just until it’s combined.
    12 ounces lemon curd, 1 tsp vanilla bean paste, tiny pinch fine sea salt
  • Spread half of the cream onto the first layer of cake. Drizzle some more curd on top of the cream and repeat with the top layer. Top with lemon slices.

Notes

This makes one tall 8 inch cake or two shorter ones. I made the one tall and sliced it in half.
*I used 1 jar of bone maman. If you find Dickinson’s, get two jars or make one batch at home

Nutrition

Calories: 509kcalCarbohydrates: 59gProtein: 6gFat: 29gSaturated Fat: 13gPolyunsaturated Fat: 3gMonounsaturated Fat: 9gTrans Fat: 0.1gCholesterol: 66mgSodium: 256mgPotassium: 133mgFiber: 2gSugar: 45gVitamin A: 620IUVitamin C: 0.2mgCalcium: 108mgIron: 1mg
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