Ingredients
Method
- Prepare the mix-ins: Lightly toast the peanuts in a dry pan over medium heat until golden and fragrant. Let them cool completely, then chop them roughly along with the dark chocolate. Melt the 70g of butter for the batter and set it aside to cool entirely.
- The anti-sinking trick: In a small bowl, toss the chopped chocolate and cooled, roasted peanuts with a teaspoon of all-purpose flour until lightly coated. Set aside.
- The pan lining trick: Preheat the oven to 170°C (340°F) without the fan setting. Lightly grease a standard loaf pan with neutral oil. Cut three strips of parchment paper: two shorter strips for the side walls, and one long strip to cover the bottom and extend over the two shorter edges. The oil acts as a "glue" holding the paper flat, and the long overhang creates handles for easy removal after baking.
- Whip the meringue: In a meticulously clean and grease-free mixing bowl, whip the egg whites until soft peaks form. Gradually add the granulated sugar while continuously whipping until the meringue is glossy and holds stiff peaks. Do not overbeat until dry!
- Fold with a whisk: Using a hand whisk (not a spatula yet!), very gently fold the single egg yolk into the stiff meringue.
- Add the dry ingredients: Sift the flour and baking powder together. Still using the hand whisk, gently fold the dry mixture into the meringue in three batches, being careful not to deflate the trapped air. The whisk cuts through the meringue better than a flat spatula for these fine ingredients.
- Fold with a spatula: Now switch to a silicone spatula. Gently fold in the flour-coated chocolate and roasted peanuts.
- The final fat: Pour the melted, completely cooled butter down the side of the bowl and use the silicone spatula to fold it in swiftly but gently until just combined.
- Bake: Pour the batter into the prepared loaf pan and smooth the top. Bake for 30–35 minutes, or until a wooden skewer inserted into the center comes out clean.
- Cool: Let the loaf cool in the pan for 10 minutes. Then, grab the overlapping parchment paper handles and lift the loaf directly onto a wire rack to cool completely.
Notes
The Chemistry of Roasting Peanuts 🧪
Never skip roasting the peanuts! Toasting them in a dry pan acts as a catalyst, opening up the cellular structure of the nuts and releasing fat-soluble essential oils. This transforms the flavor from raw to incredibly warm and aromatic, perfectly complementing the dark chocolate.
The Sinking Chocolate Hack
Tossing heavy mix-ins like chocolate chunks and nuts in a little flour before adding them to the batter is a vital step. The flour absorbs surface moisture and creates friction against the batter, which stops the heavy pieces from sinking to the bottom during the bake. Never use powdered sugar for this, as it will melt into a syrup and cause the pieces to sink faster!
Butter Temperature 🧈
Always ensure the melted butter is completely cooled before folding it into the batter. If the butter is too warm, it will instantly deflate the whipped egg whites, resulting in a dense and rubbery cake.