8: Mix until smooth. Don't worry if you can feel that there are still some sugar crystals undissolved; this will add texture, so worth keeping. Tkae the mixture off the bain-marie.
10: Pour the mixture into this mould and leave to cool. Refrigerate overnight.
11: After the dough has rested for 1 hour, knock back the dough by lifting and dropping hard back into the bowl. Cover once more with plastic film and refrigerate overnight.
12: Next day, take the square of chocolate butter out of the fridge and leave at room temperature to soften slightly.
13:
Toast the pecan nuts
Preheat the oven to 300°F (150°C). Spread 20 g brown sugar on a baking sheet.
14: Toast in the oven for 15 minutes. Leave to cool.
15:
Flake the brioche
Put the brioche dough on a floured work surface.
16: Roll out into a large rectangle, about the same width as the square of chocolate butter. You can trim the sides to neaten the rectangle and use the trimmings to make the leaven or soured dough for your next batch of brioche.
17: Lay the square of chocolate butter on the dough.
18: Cover the chocolate with the pecan nuts, either whole (as in the photo) or roughly chopped with a knife.
19: Fold the dough over to seal in the chocolate butter, then scatter coarse sugar crystals over and press in with the rolling pin to help them stick.
20: Fold the dough in half over the sugar.
21:
Shape the brioche
Roll the dough out once more into a rectangle...
22: ...and roll this up.
23: Cut the roll into slices about the same thickness as the depth of your tin or mould, either loaf style...
26: Leave in a warm place to rise for 1 hour 30 minutes. Before baking, you can scatter a little more coarse sugar over the top if you wish.
27:
Bake the brioche
Preheat the oven to 390°F (200°C) and bake the brioche for about 40 minutes.
28: Turn out while hot and leave to cool on a wire rack.
Remarks
You will notice that the chocolate brioche dough is a lttle more complicated to make than a plain brioche dough. The ingredients are added in stages to obtain the right texture. It is also a bit sweeter to balance the slight bitterness of the cocoa.