Yield: Yields about one pint.
One of the best things about making your own tomato purée is that it easily becomes homemade ketchup, which is better-tasting and healthier for you than commercial ketchup.
Put the tomato purée and onion in a heavy-duty 4-quart pot. Bring to a boil over medium heat. Lower the heat to medium low and simmer, stirring frequently to prevent scorching, until the onions are very soft and the flavors are melded, about 20 minutes. (If you want very smooth ketchup, you can pass the mixture through a food mill at this point to purée the onions.)
Remove the spices from the vinegar and add the vinegar to the tomato mixture. Add the sugar and salt and stir well. Continue to simmer until the ketchup is thick enough to spoon but still runny enough to pour, about 65 minutes. Cool to room temperature and then refrigerate. The ketchup will keep for about 2 weeks.
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