Cheat's tomato soup.
1 tin of tomato soup
1 very, very large courgette
1 small potato
1 stock cube
Fry onion in butter or oil, add soup, courgette, diced potato and stock. Boil until cooked and blitz.
Wing it soup
Left over Cheat's tomato soup
Left over broccoli from roast dinner
Left over gravy from roast dinner
Chuck in a pan, heat up and blitz.