I do a weekday Spag Bol and a weekend Bolognese!
The weekday one is fry off bacon bits, onion, carrot, garlic, celery if I have it, mince, splash of wine or Marsala, chuck in a tin of toms, purée, Worcestershire, oregano, a bit of beef stock, pinch of sugar and simmer for 20 mins, stir through a spoon of crème fraîche before serving. Lots of Parmesan on top.
The weekend one is either Nigel Slater or Jamie's from his Italian book, simmered for 1.5hrs.