02 The Build
Layer Cake | Quarter-Sheet, Stacked
A big strawberry reduction, baked thin and stacked four layers tall.
01 The Idea
This is a quarter-sheet riff on Liz Marek's Sugar Geek strawberry cake. The plan was a half-sheet baked flat and cut into strips for a rectangular layer cake, then scaled down to a quarter-sheet for a table of two. I pushed the canola oil for a tender crumb and leaned hard on a big strawberry reduction so the fruit would actually survive the oven.
It came out thinner than I wanted. The batter ran liquid-heavy, so the layers baked low, and one of them took the pink dye unevenly and went noticeably purple. The frosting-to-cake ratio ended up high, so a finished slice reads frosting-forward. I stacked four narrow strips anyway, filled each with strawberry buttercream and a swirl of the red reduction, and finished with fanned fresh berries and crushed freeze-dried strawberry.
The reduction is the whole point. Cook the berries down hard so the fruit survives the oven.
Two records came out of this bake: exactly what I baked, below, and a taller next-time version I have not tested yet. The honest one is the one that produced a cake.
02 The Build
03 The Components
Amounts as actually baked, the quarter-sheet version. It runs small on purpose. A full buttercream batch is more than this cake needs, with leftovers.
make it all, only part goes in
whisked smooth, set aside
creamed five minutes, pale and fluffy
a full batch, more than enough
04 The Method
Reduction first. Puree the strawberries with the sugar, then simmer down to about one cup, loose-jam thick. Cool fully. Make it a day ahead if you can, it deepens in the fridge. Only 57 g goes in the batter, the rest is for filling.
Wet and dry. Whisk the wet mix until uniform and set it aside. In another bowl whisk the cake flour, baking powder, baking soda, and salt.
Cream. Beat the butter smooth, stream in the sugar, and cream five minutes until pale and fluffy, scraping halfway. Add the egg white and beat until smooth and emulsified.
Combine. On low, alternate the dry and wet in thirds, dry, wet, dry, wet, dry, wet, mixing just until combined. Scrape the bowl and the paddle.
Bake. Heat the oven to 350°F. Grease a quarter-sheet (9x13), line with parchment, grease again. Spread the batter even with an offset spatula. Bake fifteen to twenty minutes, until a toothpick pulls clean or with a few moist crumbs.
Chill before cutting. Cool fully in the pan, then chill thirty minutes. This crumb is fragile from the extra oil, so cold is essential for clean strips. Cut into four equal strips.
Buttercream. Grind the freeze-dried strawberries to a powder and beat it into the butter, powdered sugar, milk, vanilla, and salt until smooth and pale pink.
Fill and stack. Fill each layer with buttercream and a swirl of the red reduction. Stack all four strips into a narrow block.
Coat. Crumb coat the block and chill, then give it a smooth-ish full coat of buttercream.
Finish. Fanned fresh strawberry slices on top and a dusting of crushed freeze-dried strawberry over the top and edges.
It baked thin, and the next version is a guess
The batter ran liquid-heavy and the layers came out low. There is a taller next-time version drafted, but it holds the cake flour at 120 g while scaling the fats and sugar up. That is inconsistent scaling and might bake denser instead of taller. Verify it with one bake before trusting it. The amounts above are the version that actually produced a cake.
Honest note. The revolume is a hypothesis, not a tested batch.