Not the best recipe if you’re following a low-cholesterol diet, but if you want a comforting, indulgent supper dish that will warm you to the tips of your toes, this is the one for you.
10oz (300g) leeks, washed thoroughly and sliced
10oz (300g) purple sprouting broccoli
1 tbsp butter
1 heaped tbsp flour
10 fl oz (250ml) milk
10 fl oz (250ml) water reserved from cooking the PSB and leeks
4 tbsp cream
2 balls mozzarella cheese
2oz (50g) gruyere cheese
salt and pepper
Preheat the oven to gas mark 4 (180C, 350F).
Start by steaming the PSB and leeks for 5-10 minutes, until tender but still with some bite to them. Don’t throw out the cooking water – you’ll need it for the white sauce.
While they’re cooking, melt the butter in a saucepan and stir in the flour. Cook, stirring, for a couple of minutes until they form a smooth paste. Then gradually add the milk, stirring continuously. Finally, add the reserved cooking water from the vegetables and bring to simmering point. Cook for 10 minutes, until the sauce has thickened. Then season with salt and pepper and stir in the cream.
Put the cooked PSB and leeks in a baking dish and pour over the white sauce. Then slice the mozzarella into discs and arrange over the top. Grate the gruyere cheese on top of that, and bake in the oven for about half an hour, until the cheese is browned on top.

