I had spag bol today, I can't remember how many discover points it used to be but it was always a low meal for me. Sainsbury's do extra lean mince, 500g makes enough for 4 people.
For the sauce, fry the onions in spray until soft, fry the mince, add a can of chopped tomatoes. Add dried herbs (I use basil and oregano), about a teaspoon of each, a teaspoon of sugar or sweetner, a dash of Worcestershire sauce, a teaspoon of paprika (optional), salt & pepper, simmer, done!