Basic, versatile tomato sauce

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1 tbsp olive oil

1 onion, finely chopped

2 garlic cloves, crushed

2 tbsp tomato purée

800g tinned chopped tomatoes

1 pinch of sugar

Salt and black pepper

1 small handful of fresh basil leaves, finely chopped

Optional extras:

1 tbsp balsamic vinegar

60ml red wine

1 pinch of dried chilli flakes

40g Parmesan, grated

2 sprigs of rosemary, leaves picked and chopped