Exquisite Lemon Cake

The lemon curd filling is what makes this cake worth its name. Butter, sugar, fresh lemon juice, zest, and eggs cooked in a double boiler until thick and glossy, then spread between the layers and over the top. It’s not a stiff frosting. It’s a thin, intensely lemony coating that soaks slightly into the cake and leaves a shiny, tart finish.

The cake itself is a straightforward vanilla layer cake. Shortening creamed with sugar, eggs added one at a time, milk and vanilla mixed in, then sifted flour with baking powder and salt folded in gradually. It bakes into a tender, fine crumb that absorbs the lemon curd without falling apart.

Adding eggs one at a time during creaming is important. Each egg needs to fully incorporate before the next goes in, or the batter breaks and you lose the smooth, even texture.

Kitchen Tips

• Stir the lemon curd constantly over the double boiler. Eggs scramble fast if left unattended, and you’ll end up with lumpy curd.
• Cool the curd completely before spreading on the cake. Warm curd melts into the layers and slides off the sides.
• The filling is intentionally thin and won’t fully cover like buttercream. That’s by design. The lemon flavor is concentrated and a thick coat would be overwhelming.
• Use fresh lemon juice, never bottled. Bottled juice has a dull, flat taste that shows up clearly in a curd.

Variations

• Lemon buttercream: For a thicker frosting, fold the cooled lemon curd into whipped butter for a lemon buttercream.
• Lime version: Swap lemon for lime juice and zest for a key lime layer cake.