This is easy to make and has a delicate flavour that combines luxuriantly with the buttery sauce. Serve simply with a mixed leaf salad for the ultimate treat.
Preheat the oven to 180°C/Gas mark 4. Half-fill a roasting pan with hot water and place in the oven. Generously butter a 1litre ring mould, a round cake tin or 4 individual metal moulds.