Beatty's Chocolate Cake

INGREDIENTS

1 3/4 cups

all-purpose flour, plus more for pans

2 cups

sugar

3/4 cup

good cocoa powder

1 3/4 tsp

baking soda

1 tsp

baking powder

1 tsp

kosher salt

1 cup

buttermilk, shaken

1/2 cup

vegetable oil

extra-large eggs, at room temperature

1 tsp

pure vanilla extract

1 cup

freshly brewed hot coffee

Buttercream:

6 oz

good semisweet chocolate (recommended: Callebaut)

1/2 lb

unsalted butter, at room temperature

extra-large egg yolk, at room temperature

1 tsp

pure vanilla extract

1 1/4 cups

sifted confectioners' sugar

1 tbsp

instant coffee powder