Meanwhile, to make the sauce, melt the butter, muscovado sugar and treacle over a very low heat in a heavy-based saucepan. Once the butter’s melted, stir gently until everything else is melted too.

To marinate the beef, mix the treacle with 100ml/3½fl oz of water ... To serve, heat the red wine sauce or gravy. Slice the beef and add to serving plates with the sauce, spinach, roasted ...