Bright Lemon Layer Cake with Silky Lemon Buttercream
My One Non-Negotiable Tip
Let the cake layers cool completely before you even think about frosting them. If they're even slightly warm, the buttercream will melt and slide off. I wait at least 1 hour after they come out of the pans. If I'm in a hurry, I pop them in the freezer for 15 minutes.
This lemon layer cake is bright, balanced, and genuinely stays moist for days. The reverse-creaming method makes it forgiving for bakers at any level, and the homemade lemon curd adds a tangy punch that store-bought can't match. Whether it's for a birthday, a spring gathering, or just because you need something sunny on the table, this cake delivers.
Frequently Asked Questions
Can I use all-purpose flour instead of cake flour?
Yes, but the texture will be slightly denser. For a closer substitute, measure 2 cups all-purpose flour, remove 4 tablespoons, and replace with 4 tablespoons cornstarch. Sift together three times before using.
Why did my lemon curd turn out runny?
It likely didn't cook long enough. The curd needs to reach 170°F (77°C) to set properly. Stir constantly over medium-low heat until it visibly thickens and coats the back of a spoon. Also, make sure to strain it to remove any cooked egg bits.
Can I make this cake ahead of time?
Absolutely. Bake the cake layers up to 2 days ahead and wrap them tightly in plastic wrap once cool. The lemon curd can be made 3 days ahead. Assemble and frost the day you plan to serve for the freshest taste.
How do I get clean, even cake layers?
Use a kitchen scale to divide the batter evenly (about 380g per 8-inch pan). If your cakes dome slightly, use a serrated knife to level the tops before assembling. Chill the cake for 30 minutes before slicing with a sharp knife.
Recipe: Bright Lemon Layer Cake with Silky Lemon Buttercream
Equipment
- three 8-inch round cake pans
- stand mixer or hand mixer
- rubber spatula
- cooling rack
- offset spatula
- piping bag (optional)
- serrated knife
Ingredients
- For the Cake:
- 2 ½ cups 300g cake flour
- 1 ½ cups 300g granulated sugar
- 1 tablespoon baking powder
- ½ teaspoon salt
- 1 cup 226g unsalted butter, at cool room temperature (65°F/18°C)
- 4 large eggs (at room temperature)
- 1 cup 240ml whole milk, at room temperature
- 2 tablespoons fresh lemon zest (from about 3 lemons)
- 2 tablespoons fresh lemon juice
- 1 teaspoon vanilla extract
- For the Lemon Curd:
- ½ cup 120ml fresh lemon juice (from about 3 lemons)
- 1 tablespoon fresh lemon zest
- ½ cup 100g granulated sugar
- 3 large egg yolks
- 4 tablespoons 56g unsalted butter, cut into small pieces
- For the Lemon Buttercream:
- 1 cup 226g unsalted butter, at room temperature
- 4 cups 480g powdered sugar, sifted
- 3 tablespoons fresh lemon juice
- 1 tablespoon fresh lemon zest
- 2 tablespoons heavy cream (or whole milk)
- Pinch of salt
Instructions
- Make the lemon curd first. In a small saucepan, whisk together lemon juice, lemon zest, sugar, and egg yolks. Cook over medium-low heat, stirring constantly with a heatproof spatula, until it thickens enough to coat the back of a spoon (about 5-7 minutes, or 170°F/77°C on an instant-read thermometer). Remove from heat and stir in the butter pieces until smooth. Pour through a fine-mesh strainer into a bowl, cover with plastic wrap pressed directly onto the surface, and refrigerate until cold (at least 1 hour).
- Preheat your oven to 350°F (175°C). Grease three 8-inch round cake pans, line the bottoms with parchment rounds, and dust with flour.
- In the bowl of a stand mixer fitted with the paddle attachment, combine the cake flour, sugar, baking powder, and salt. Mix on low for 30 seconds to aerate.
- With the mixer on low, add the butter pieces one at a time, mixing until the mixture looks like damp sand with no large butter lumps (about 2 minutes). This is the reverse-creaming method — it coats the flour in fat and limits gluten development, giving you a tender, even crumb.
- In a separate bowl, whisk together the eggs, milk, lemon zest, lemon juice, and vanilla until combined.
- With the mixer on low, add the wet ingredients in three additions, scraping down the bowl after each. Mix just until the batter is smooth — about 30 seconds total. Do not overmix.
- Divide the batter evenly among the prepared pans (about 380g per pan). Bake for 22-25 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs, and the edges pull away slightly from the pans.
- Cool the cakes in their pans on a wire rack for 10 minutes, then turn them out onto the rack to cool completely. Wait until they are fully room temperature before assembling.
- While the cakes cool, make the lemon buttercream. In the bowl of a stand mixer with the paddle attachment, beat the butter on medium-high until pale and creamy (about 3 minutes). Reduce speed to low and gradually add the powdered sugar, then add the lemon juice, zest, cream, and salt. Increase speed to medium-high and beat for 2-3 minutes until light and fluffy. If the frosting seems too soft, refrigerate for 10 minutes.
- To assemble, place one cake layer on a serving plate or cake stand. Spread half of the chilled lemon curd over the top, leaving a ½-inch border. Repeat with the second layer and remaining curd. Top with the third layer.
- Frost the entire cake with the lemon buttercream, starting with a thin crumb coat (a thin layer that seals in crumbs). Refrigerate for 15 minutes to set, then apply the final coat. Use an offset spatula for smooth sides, or create swirls on top with a piping bag.
- For clean slices, refrigerate the finished cake for at least 30 minutes before cutting. Use a sharp serrated knife, wiping it clean between cuts.