I like to make mine with stock and veggies and herbs and stuff but if you're wanting a p*ss easy recipe it would have to be this:

500g mince
2 tins tomato, onion, garlic & basil (you can get these from woolworths/safeway they're real cheap)
1 small jar tomato paste
pinch of sugar (this helps to really bring out the flavour in the tomatoes)
salt, pepper

Too easy, brown mince and drain the fat out. Stick in the tinned stuff and the tomato paste, add your pinch of sugar, season to taste with the salt & pepper and simmer it for a good 45 mins stirring every now and then so it doesn't stick to the bottom.

I usually add things like grated zuchinni and carrot and some beef stock and you can add oregano or parsley depending on how you like it.