This is the time of year when veg is cheap and plentiful. Those bags of reduced veg because the sell by date is near are still good. This is a great, filling, cheap soup that is very low on calories, fat and carbs.
http://www.deliaonline.com/recipes/type-of-dish/soups/slow-cooked-root-vegetable-soup.html
(It is zero points on the Weight Watcher plan but excellent for all diet plans)
Make in bulk and freeze the surplus in individual portions.
Spaghetti bolognese is good if you are prepared to forego the garlic bread. Wholewheat pasta is much better than white and once you've tried it you'll not go back. For two people I would use at leasxt half a pound of lean mince (or leftover beef, finely chopped). I put two chopped onions in a saucepan with the lid over a very low heat for 20 minutes. This makes them go soft and translucent without added oil. Add the beef, turn the heat up and cook for a few minutes. Drain the fat off. Add a tin of tomatoes (the cheapest are just as good), a pepper, mushrooms, tomato paste (cheapest tube you can find), salt, pepper, more oregano and basil than you'd expect to use - two heaped teaspoons of each.
Cook over a very low heat for at least and hour and serve with the wholewheat pasta.
If I have some courgette lying around I'll add that, too.