
Preheat the oven to 375 degrees F and put a rack in the middle or upper third of the oven. Butter two 9″x13″ glass pans and line with buttered parchment paper.
Sift together the flour, baking powder, and salt. In another bowl, whisk together the egg whites and buttermilk.
Cream the butter, zest, and sugar in a mixer on medium speed for a full 3 minutes until very light and fluffy. Beat in the lemon extract, then add 1/3 of the flour mixture, still on medium speed.
Beat in half of the egg-buttermilk mixture, then half of the remaining flour mixture, then the last of the egg-buttermilk mixture, and finally the last of the flour, beating until the batter is smooth. Beat the entire batter on medium high for two minutes until completely smooth and mixed.
Divide the batter in two (it’s about 6 cups total batter.) Dye each batter a different color of the rainbow and scrape into the two pans.
Bake 20 minutes, rotating halfway through, or until a thin knife inserted in the middle comes out clean.
Cool in the pans five minutes, then turn out onto a cooling rack. To ensure moistness, once the cakes are cooled, wrap immediately and chill.
- 1 CUP SUGAR
- 4 LARGE EGG WHITES
- 3 STICKS (12 OUNCES) UNSALTED BUTTER, AT ROOM TEMPERATURE
- 1/4 CUP FRESH LEMON JUICE (FROM 2 LARGE LEMONS)
- 1 TEASPOON PURE VANILLA EXTRACT
Put the sugar and egg whites in a mixer bowl or other large heatproof bowl, fit the bowl over a pan of simmering water and whisk constantly, keeping the mixture over the heat, until it feels hot to the touch, about 3 minutes. The sugar should be dissolved, and the mixture will look like shiny marshmallow cream. Remove the bowl from the heat.
Working with the whisk attachment or with a hand mixer, beat the meringue on medium speed until it is cool, about 5 minutes. Switch to the paddle attachment if you have one, and add the butter a stick at a time, beating until smooth.
Once all the butter is in, beat the buttercream on medium-high speed until it is thick and very smooth, 6 to 10 minutes. During this time, the buttercream may curdle or separate – just keep beating and it will come together again. On medium speed, gradually beat in the lemon juice, waiting until each addition is absorbed before adding more, and then the vanilla. Press a piece of plastic against the surface of the buttercream and set aside briefly.
Assembling the cake
Cut baking papers into strips and place under the cake. Set the purple layer in the bottom. Spread with a small amount of melted jam, then a small amount of cream.
Top with the blue layer. Spread again with jelly, then a small amount of buttercream. You want very thin layers of buttercream, just enough to cover the cake. Repeat with the remaining layers, spreading each with jelly and alternating between and buttercream.
Wipe excess filling off the sides. Cover the entire cake with buttercream. Some people make a first layer of frosting (a crumb coat) and refrigerate for 20 minutes. Then they frost the entire cake and decorate accordingly to one's taste.
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