Sauté the onion in olive oil for 2 minutes on a medium heat. Add the garlic for 1 further minute. Add the tomatoes, tomato puree and dried herbs if using. If using fresh, add at the end. Season with salt and cracked black pepper.
Bring to the boil then reduce to a simmer. Reduce down to concentrate for 10 minutes with the lid ajar slightly to prevent splattering all over your kitchen. Stir through torn basil leaves if using fresh.
Blitz with a hand blender or leave chunky if you prefer.
