Chocolate-Dipped Madeleines

STEP 1: BROWN THE BUTTER AND STEEP THE COFFEE

Melt the butter in a small heavy saucepan over medium heat and keep cooking, swirling, for 4-6 minutes until the milk solids at the base turn a deep hazelnut brown and the smell turns nutty. Pull it off the heat immediately, stir in the ground coffee, and leave it to infuse for 10 minutes off the heat. Strain through a fine sieve into a bowl and set aside to cool to barely warm. Browning deepens the roasted register so the coffee reads as coffee rather than as a bitter note.

STEP 2: MAKE THE BATTER

Whisk the eggs and sugar together in a bowl until pale and just thickened - a minute by hand is enough, you are not building a sabayon. Whisk in the condensed milk, honey and vanilla. Sift the flour, baking powder and salt over the top and fold gently until barely combined. Pour the cooled coffee butter down the side of the bowl and fold until the batter is smooth and glossy, with no butter pooling at the base. Overmixing here builds gluten and flattens the hump.

STEP 3: CHILL THE BATTER - DO NOT SKIP THIS

Press cling film directly onto the surface of the batter and refrigerate for at least 1 hour, and ideally overnight. Cold batter hitting a hot mould is the entire mechanism of the madeleine's hump: the outside sets while the still-cold centre is only beginning to expand, and the rise has nowhere to go but up. A rested batter also hydrates the flour, which gives a finer crumb.

STEP 4: MAKE THE WHITE CHOCOLATE AND YUZU PASTRY CREAM

Bring the milk and cream to a bare simmer in a medium saucepan. Meanwhile whisk the yolks, sugar and cornstarch together until smooth and pale. Pour about a third of the hot milk into the yolks in a thin stream, whisking constantly, then return everything to the pan. Cook over medium heat, whisking without stopping and reaching into the corners, until the cream thickens and comes to a boil - then keep whisking through 60 to 90 seconds of boiling, which is what cooks out the starch and stops it tasting chalky. Off the heat, add the white chocolate and salt and whisk until fully melted, then the butter, then the yuzu juice and zest. The acid goes in last and off the heat - added to a hot starch-set cream it will thin it. Strain through a fine sieve into a shallow dish, film the surface, and chill until cold, at least 1 hour.

STEP 5: PREPARE THE MOULDS AND BAKE

Heat the oven to 400F (200C). Brush the madeleine shells thoroughly with softened butter, working into every ridge, then dust with flour and knock out the excess - or brush and freeze the tin for 10 minutes, which is more reliable. Spoon or pipe the cold batter into each shell, filling only about three-quarters; the batter will spread and climb. Bake for 9-11 minutes until the humps are risen and set and the edges are a deep golden brown with crisp frills. Tap the tin firmly on the counter and turn the madeleines out onto a wire rack at once. They stale fast and are at their best within a couple of hours of leaving the oven. Butter, flour and refill the tin between batches.

STEP 6: FILL THE MADELEINES

Whisk the cold pastry cream smooth - it will have set firm - and transfer it to a piping bag with a small round tip. Push the tip into the hump side of each cooled madeleine, about halfway in, and pipe until you feel a slight resistance and the shell just gives. Wipe the entry point clean. Filling from the hump rather than the end means the entry hole disappears under the chocolate at the next step, so the finished shell has no visible wound. Reserve any leftover cream to serve alongside.

STEP 7: DIP IN DARK CHOCOLATE AND FINISH

Melt the dark chocolate gently - a bowl over barely simmering water, or 20-second bursts in a microwave, stirring between each - then stir in the oil and the optional ground coffee. Let it cool to about 88F (31C) so it sets with a snap rather than a smear. Dip each madeleine shell-side down to about halfway, let the excess run off against the rim of the bowl, and set on parchment. Scatter cocoa nibs and a few flakes of salt over the wet chocolate. Leave to set at cool room temperature, not in the fridge, which dulls the surface. Serve within a few hours, with a small glass of iced coffee alongside if you want the reference made explicit.