Lentil soup

Oh well, a little soup for the soul - so as I'm feeling really poorly, decided I'd pop on some soup for my lunch and daughter's afterschool snack. It's freezing today, so soup will certainly warm her up before her singing lesson.

Lentil Soup
2 tblsp olive oil
1 large onion
4 carrots
1 stalk celery
4 oz red lentils
1 pint chicken stock
1 pint water
2 tblsp tomato puree
salt & pepper

Chop the onion, celery and carrots into small dice. Sweat them off in the pan in the olive oil until the onions are soft, then add the lentils, fry off for about 30 secs. Add the stock, water and tomato paste, simmer until all veg are tender and the lentils are cooked. Add salt and pepper to taste. Whizz using a hand blender until smooth. Add water if needed to get the right consistency.
Serve