Pea and lettuce braise

Melt the butter in a heavy-based, high-sided frying pan. Add the onion to the pan and cook over medium heat, stirring often, until soft and golden.

Mix in the peas, then add the stock. Bring to the boil and cook briskly for 5-6 minutes.

Add in the lettuce, reduce the heat and simmer for 3 or 4 minutes. Season with salt and freshly ground pepper and serve immediately.