Tomato and lentil soup

Ingredients
1 medium onion
1 red pepper
100g dried lentils
1 can of chopped tomatoes
1 teaspoon of sweetener
Salt and Pepper to taste
Tomato puree

Method
Chop the onion and red pepper into chunks and place in a pan with the lentils.  Add about 2 pints of boiling water and simmer for 20 minutes. Add the tomatoes and sweetener then simmer for a further 5 minutes. Let it cool for a while then place it in a blender. You may need to do this in portions if you don't have a large blender.  Blend the mixture and return it to a pan. Add tomato puree to thicken the mixture or more water if necessary. Season with saltand pepper. Heat through before serving.