3lb (1kg 350g) small leeks, trimmed and washed and cut in half
salt and pepper
1 tbsp (15g) Dijon mustard
1 tsp (5g) English mustard
3oz (50g) plain flour
1 tbsp (15g) wholegrain mustard
2oz (50g) butter
6oz (175g) cheddar cheese, grated
1oz (25g) grated cheddar cheese
ΒΎ pint (425ml) milk
1oz (25g) parmesan, or similar vegetarian hard cheese, grated