½ tsp bicarbonate of soda
125²µ/4½´Ç³ú soft dark brown sugar
125²µ/4½´Ç³ú buckwheat flour
25g/1oz cocoa powder, sieved
½ tsp fine sea salt
1 tsp vanilla paste or extract
150²µ/5½´Ç³ú dark chocolate chips
125²µ/4½´Ç³ú dark chocolate (minimum 70% cocoa solids)
60g/2¼oz soft unsalted butter
2 large free-range eggs, fridge-cold