Dark Chocolate Layer Cake (Bruce Bogtrotter Level)

Heat oven to 350°F (175°C) with a rack in the center. Butter three 8-inch round pans, line the bottoms with parchment circles, then butter and lightly flour the parchment and sides, tapping out excess.

Whisk the near-boiling coffee with the 90 g cocoa in a small bowl until smooth, and let it sit 1 minute. This blooms the cocoa before it ever touches the flour.

In a large bowl, whisk the flour, sugar, baking soda, baking powder, and fine salt. In another bowl whisk the eggs, yolk, buttermilk, oil, vanilla, and the melted chocolate if using. Pour the wet into the dry and whisk just until combined.

Stream the warm cocoa-coffee mixture into the batter while whisking until smooth. The batter will be very thin and pourable — correct. Let it rest 5 minutes.

Divide the batter evenly among the three pans — weigh them on a scale for equal layers. Bake 28–34 minutes, until a toothpick comes out with a few moist crumbs and the center reads 205–210°F. Rotate pans halfway if your oven runs uneven.

Cool layers 10 minutes in the pans, then turn out onto a wire rack and cool completely. To speed things, chill the turned-out layers 20 minutes. Never frost warm layers.

Make the soaking syrup: warm the 80 ml coffee, 40 g sugar, and 5 g cocoa in a small saucepan, stirring until dissolved. Cool. You'll brush this between layers.

Make the ganache: place the chopped 340 g chocolate, 30 g butter, and pinch of salt in a bowl. Heat the cream until it just steams with small edge bubbles — do not boil hard. Pour over the chocolate, rest 2 minutes undisturbed, then stir slowly from the center outward until glossy. For a flawless emulsion, finish with an immersion blender held at the surface to avoid air bubbles.

Cool the ganache to spreadable consistency — room temperature, or chilled and stirred every 10 minutes — until it has the texture of soft peanut butter. This takes 30–60 minutes at room temp.

Whip the cooled ganache 30–60 seconds only, until it lightens slightly and holds soft peaks. Stop early. If it goes grainy, warm a spoonful and stir it back in to recover.

Level the layers with a serrated knife. Anchor the first layer on the plate with a dab of ganache, brush it with soaking syrup, then spread an even layer of whipped ganache. Repeat with the second layer (syrup, then ganache), then top with the third and brush its top with syrup.

Crumb coat: spread a thin layer of whipped ganache over the whole cake to trap crumbs. Refrigerate 15 minutes until firm to the touch.

Final coat: apply the remaining whipped ganache to top and sides. Smooth with an offset spatula held at a low angle — let the blade, not the tip, do the work, spinning the cake on a turntable while keeping the spatula still. Or leave rustic swoops. Finish with flaky salt.