Grease a 25cm/10in cake tin with butter and line with greaseproof paper. For the chocolate cake, in a large bowl, cream the butter and sugar together ... cover it with a sheet of aluminium foil.) ...

Place the chocolate in a large, heatproof bowl. Pour the cream into a small saucepan, bring to a simmer, then remove from the heat. Heat the sugar in a medium-sized saucepan ... Bake for 25–30 minutes ...

Make it Spicy: Chili powder or cayenne powder are great additions that complement chocolate if you want spicy Texas Sheet ...