I took advantage of the leeks that came in our weekly farm box delivery to try a soup that I had been curious about for a while. I turned to our mainstay for vegetarian cooking - Deborah Madison - for the recipe, which was so simple I felt the need to embellish it a bit. With just seven ingredients listed (in addition to water): leeks (white part only); potatoes; butter; salt and pepper & and milk. I replaced half of the water with vegetarian soup stock to give this a little more body. Madison actually uses the word "meager" in her own description. This was very easy to make. I cooked the chopped leeks and potatoes in butter for about 10 minutes in the soup pot, then added the liquid (2 cups of soup stock + 2 cups of water) and simmered for about half an hour. Then added some milk and heated again before serving. While I wouldn't exactly use the word meager, it did seem to be lacking in flavor. Next time I will use a higher proportion of soup stock, more milk, and add garlic and a few more herbs. I did learn something very important in preparing this meal: the instructions said to "set the leeks in a bowl of water to soak while you prepare the potatoes, then lift them out with a strainer, letting any sand fall to the bottom". Good thing I followed that. I had no idea. I would have been pretty disappointed if I'd ended up with gritty soup. James made some potato bread in our bread machine to go with this, which made the meal more hearty.
Milk is optional in this recipe, so it can easily be made vegan.