I like a good bolognese sauce. Its also a great fridge cleaner. This is how I make mine.
dice onion and fry with some garlic in oil till tender
(meat option) brown in some mince (ground beef) or whatever kind of minced meat you like
chuck in some sliced mushrooms, capsicum(peppers), carrots, like I said, its a great fridge cleaner
salt + pepper to taste (sometimes I'll put in chilli flakes if I feel like it)
I put in a tin of chopped tomatoes, but you can put in tinned tomatoes and just squash them around
water + tomato paste until its the right thickness
I LOVE to put in some sliced kalamata olives at this stage
basil, oregano, whatever herbs you want. Oregano is pretty important tho
simmer for about 15minutes or so. Watch that it doesn't get too dry, stir occassionally
You can put this on pasta, rice, whatever. Up a bit on this page I have it cooked in with some meatballs. Its just a great simple sauce.