Preheat oven to 180 fan forced (or 200 no fan)
Toss tomato, brown onion and garlic in olive oil, salt, pepper and dried basil
Bake until tomatoes are roasted and soft (around 45 mins)
Peel the skin off the tomatoes and blitz in a food processor
Keep the oil from the roasting pan, add to a saucepan and reduce the sauce
Serve with fresh basil and pasta