pistachio & lemon cake
yellow cake:
adapted from smitten kitchen
4 cups plus 2 tablespoons cake flour
2 tsp baking powder
1 1/2 tsp baking soda
1 tsp salt
1 cup butter, softened
2 cups sugar
2 teaspoons vanilla extract
4 large eggs, at room temperature
2 cups buttermilk (or two cups milk soured with a splash of lemon juice)
Heat oven to 350°F. Line the bottoms of two 6" cake pans with parchment paper.
Combine flour, baking powder, baking soda, and salt in a bowl. Cream butter and sugar together until light in colour. Add vanilla and eggs and beat to combine. Scrape the sides of the bowl and eat again until well incorporated.
On the lowest speed, beat in buttermilk. Add flour mixture in three additions. Hand mix with a spatula a little to avoid flour explosions. Scrape down bowl to make sure there are no unmixed spots.
Reserve about ⅓ of the he batter for another use (pop it in the freezer for some emergency cupcakes). Divide remaining batter between two prepared 9" pans. Bake 25-30 minutes, or until cakes are golden brown and a toothpick inserted into the centre comes out clean. Cool cakes and run a knife around the edge so they come out of the pan cleanly. Trim off the outer edges and level the cakes, cutting off any domed top portion.
pistachio frosting
adapted from Martha Stewart
6 tbs unbleached all-purpose flour
1 ½ cups whole milk
1 teaspoon pure vanilla extract
Pinch of kosher salt
1 ½ cups butter room temperature
1 ½ cup sugar
⅓ cup pistachio paste
2-3 drops green food colouring (optional)
Cook milk and flour in a small saucepan over medium heat, stirring constantly until the mixture thickens to a gluey, pudding consistency. Cover pan and cool to room temperature. It needs to be completely cool before the next step or it will melt the butter. Also, if you chill this mixture in the fridge, do not proceed before bring back up to room temperature - a cold mix added to butter will seize and split the frosting.
In a stand mixer with the paddle attachment, whip together butter and sugar on medium speed until light and fluffy about 5 minutes. Add in room temperature milk mixture and increase speed to medium-high. Whip until the mixture is smooth and very fluffy, which can take more than 15 minutes sometimes. It may look split or grainy, but just keep on mixing until fluffy and velvety. This always takes way longer than I think it should, so I recommend that you walk away at this point and don’t look at the frosting more often than every 5 minutes. I like to use this time to do some of the dishes I have made or have a snack. Just don’t stare at your frosting getting stressed out.
When you have smoothness and fluffiness, add in the vanilla, salt, food colouring and pistachio paste and beat until fully incorporated.
If your frosting becomes a little soft and droopy after the pistachio paste is added chill in the fridge for about 10 minutes, and the beat again. Repeat until frosting is smooth and holds a peak.
Note on pistachio paste: if you can’t find pure pistachio paste (just ground pistachios, no sugar or anything else) you can make your own. Toast 1-2 cups pistachios until fragrant and puré until a smooth paste forms. Keep in the fridge in an airtight container.
lemon curd:
adapted from Martha Stewart
In a saucepan off heat, combine all ingredients, combining well. Set over medium heat and cook, stirring constantly. When the mixture is thickened remove from heat, cover, and refrigerate until cool.
Note on pistachio paste: if you can’t find pure pistachio paste (just ground pistachios, no sugar or anything else) you can make your own. Toast 1-2 cups pistachios until fragrant and puré until a smooth paste forms. Keep in the fridge in an airtight container.
lemon syrup:
½ cup sugar
½ cup lemon juice
Mix lemon juice and sugar in a small saucepan over low heat until sugar is dissolved. Cool and store in the fridge.
assembly:
Drizzle lemon syrup generously over the cake layers and let soak in for a couple minutes.
Place one cake layer on a 9" cake board if you have it, or a flat plate or cake stand. Cover cake with a very generous layer of curd, it should be quite thickly set so you can really pile it on without oozing over the edge. Leave a thin border of uncovered cake around the edge to make space for squishing when you add the next cake layer. Sandwich next cake layer on top and cool in the fridge around 15 minutes to set up, to help the curd not ooze out into your frosting. This is a good time to finish make the frosting.
Frost the chilled cake quickly all over with an offset spatula, making sure to cover all exposed cake. Adding more frosting as you go, use an offset spatula, or bench scraper to tidy up and give the cake some nice clean angles. Chill again for 15 minutes and add a generous second layer of frosting, using the bench scraper to make smooth, straight sides. Chill again about 10 minutes, and decorate as you like, I used a sprinkles and chopped pistachios sprinkled over a little micro-forest of piped poofs and rosettes. But you do whatever feels right.