6 Inch Sunshine Citrus Cake

This is Sunshine on a Cake Stand

I endlessly tested this cake recipe during a week of freezing rain and ice, taste tested the final version with a few friends as snow fell outside, and photographed the cake on a cold day with 40mph wind slamming against my window. And so we’re calling it sunshine citrus cake because nothing is more fitting as we yearn for warmer, brighter days ahead!

Sunshine Citrus Cake Details

Flavor: If you love the sweet, sour, and refreshing flavor of fresh citrus fruits, you will fall in love with today’s cake recipe. Cream butter and sugar together for a minute before adding fresh orange, lemon, and lime zest. In this creaming step, we’re infusing flavor right into the base of the cake. Add fresh-squeezed juice into the batter when you add milk. We’ll also prepare fresh lemon curd which you’ll mix with whipped frosting to fill the cake. You have control over the citrus used, so if you want to skip the orange—go right ahead! You can also add grapefruit, use blood orange, or stick with plain lemon. Texture: The crumb is light and springy, but still holds up nicely to the creamy whipped frosting. Size: This is a 6-inch 3 layer cake. 6 inch cakes are massively popular right now because they’re a more manageable size. If you have a small family or gathering, there’s not as much leftover plus the smaller size makes for easier assembling, decorating, and serving. If you don’t have 6 inch cake pans, they’re a wonderful size to consider. I use and love (affiliate link) these 6-inch pans. And if you visit my 6-inch cake recipes page, you’ll find dozens of recipes to try! Ease: Even though the round layer cake is a smaller size than a traditional 9-inch cake, there are a few steps requiring your focus including making the lemon curd, carefully whipping the frosting, and applying a crumb coat.

Three Parts to Sunshine Citrus Cake & Why This Recipe Works

This recipe combines citrus cake layers, a lemon curd-infused whipped frosting filling, and plain whipped frosting around the exterior.

Step-by-Step Photos

Make the lemon curd and then let it cool and thicken completely: I continued testing white cake batters with cake flour and egg whites. (Ingredients I love using in my fluffy white cake.) Results were disappointing. I do NOT want you to use cake flour in this recipe because somehow—and I learned this from multiple rounds of testing—cake flour cannot hold up to the fresh juice unless you add more chemical leavener than you think you need (which can affect the taste) or use less liquid (which produces a thicker batter and denser cake). Using only egg whites dried out the cake and overall, I couldn’t get enough citrus flavor into such a large cake. I guess I have high citrus standards! Lemon cupcake batter and 6-inch cake pans to the rescue. What a triumph. I like this cake flavored with a variety of citrus. You will have between 3.5 – 4 cups of batter and it will be slightly thick with some small lumps: Prepare your 6 inch cake pans by lightly greasing them, lining each with parchment paper rounds, and then lightly greasing the parchment paper. I just use nonstick spray. After the cakes bake and cool, prepare your whipped frosting with just 4 ingredients—cream cheese, confectioners’ sugar, vanilla extract, and heavy cream. You will have about 3.5 cups of frosting. Stir 3 Tablespoons of your lemon curd into just under half of your frosting: The lemon curd portion of your whipped frosting is the cake’s filling. If you have leftover lemon curd frosting, use it on the exterior of the cake. Apply a crumb coat, which is a thin layer of frosting that “catches” any crumbs, and then refrigerate the cake. Chilling the filled crumb-coated cake establishes its structure. Without time in the refrigerator, your filled and frosted cake will fall apart. Add the remaining frosting on your chilled crumb-coated cake and if you have any leftover, feel free to pipe some on top. You can even tint the frosting yellow, green, or orange with gel food coloring. The cake pictured above does not have those details, but you can see the piping here with a Wilton 1M tip:

Helpful Tools for Citrus Cake

These are products I use and love and the links below are affiliate links. Most (but not all) of these tools are optional, so you can still make the recipe without them. That was a lot of information to prep you! If you made it down this far, you’re completely ready to begin this recipe. I hope you love this drop of sunshine.