Sauce: 3 tbsp extra-virgin olive oil 1 small onion peeled and finely diced 4 fat cloves of garlic peeled and minced 1 tsp chilli flakes (red pepper flakes) add more if you like it really spicy 4 x 400 g (4 x 14 oz) cans San Marzano tomatoes *see note 1 1 tbsp tomato puree (paste for USA) ½ tsp salt ½ tsp black pepper a good handful (about 10g/0.35oz) fresh basil leaves roughly chopped (or 1 tsp dried basil) Also: 400 g (14 oz) penne pasta ¼ tsp black pepper 2 tbsps parmesan cheese or vegetarian Italian style hard cheese for vegetarian a good handful (about 10g/0.35oz) fresh basil leaves