Serves 6

Preparation: 10 minutes
Cooking: 1 hour

Ingredients
3 good-sized leeks
about 40g butter
3 medium-sized potatoes
parmesan rinds
1.5 litres light stock or water
a handful of parsley
6 tbps grated parmesan

Method
Trim the leeks, slice into thick rings and wash thoroughly. Melt the butter in a heavy-based pan, then tip in the washed leeks and let them soften slowly, covered with a lid, over a low to moderate heat. After about 20 minutes and with some occasional stirring they should be silkily tender.

While they are softening, peel the potatoes and cut them into chunks. Add them to the leeks when they are soft and let them cook for five minutes or so, before dropping in the cheese rinds and pouring in the stock or water. Season with salt and black pepper, then partially cover and leave to simmer for a good 40 minutes.

Remove and discard the undissolved cheese rinds, scraping back into the soup any cheesy goo from them as you go. Add the leaves of parsley and blitz the soup in a blender. Check the seasoning – it may need a surprisingly generous amount of salt and pepper – and bring briefly to the boil. Serve piping hot, with the grated parmesan.