These luscious biscuits are extremely chocolatey and moist.
They are best eaten on the day they are made, although they can be stored for up to a week in an airtight container.
180g dark chocolate, roughly chopped. Suggestion Las Trincheras 72
100g slightly salted butter
150g light muscovado sugar
1 large egg, beaten
120g plain ﬂour
50g cocoa powder
1 tsp bicarbonate of soda