Add the tomato quarters to the onion rings and simmer until the tomatoes are soft and mushy.
Blend the remaining ingredients except the spaghetti and add to the tomato mixture.
Simmer until the mixture is no longer watery.
Meanwhile cook the spaghetti according to the packet instructions.
Drain well, add to the tomato mixture and simmer for another 5 minutes.
Spoon into clean, sterilised jars and seal.
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