Since we now live in Wales I thought I should start using leeks more. So the first attempt was with this soup.
1 leek, washed and diced
1 medium onion, diced
4 medium potatoes, washed and diced (I didn't peel them)
3+ cups of vegetable stock
salt and pepper to taste
1 Tablespoon butter
1 Tablespoon olive oil
Heat the oil and butter in a pan. Add the leek and the onion. (I read that to wash the leek I should slice the leek lengthwise and wash out all the sand.) Saute for about five minutes.
Add the vegetable stock, potatoes and bay leaf. Simmer for about 20 minutes, until potatoes are soft.
Remove the bay leaf. Puree until smooth (I left it just a little chunky), season and serve.