Red Lentil Soup

A real winter warmer, this one, but also great in the summer.

You will need:

2 large tomatoes, sliced
1 leek, chopped
2 medium onions, chopped
2 cloves garlic, crushed
1.5 litres vegetable stock
100-150g red lentils
1 tablespoon tomato concentrate.
a little olive oil

Put the onions,leeks and garlic into a pan with a little oil, cook until soft. Add the other ingredients, stir from time to time, and cook slowly for about half an hour, or until the lentils are tender (make sure they are tender). Blend about 3/4 of the soup, but retain the last 1/4, and add the blended mixture to the remaining soup, stir a bit and heat through for about another five minutes.