Tinned peeled tomatoes are available chopped, whole, crushed and pulped. Unless you have ripe flavoursome tomatoes to hand, tinned tomatoes make a perfectly good substitute. You might need to add
Tomato passata is a bottled tomato sauce made from fresh, ripe tomatoes that have been peeled, seeded and slowly cooked with fresh basil, onion and garlic. The thickened sauce is then passed through a sieve before it is bottled.
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