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Homemade Tomato Ketchup 3 tablespoons olive oil 3 cups onion, coarsely chopped 3 cloves garlic, minced 3 pounds ripe plum tomatoes, coarsely chopped 1/3 cup white vinegar 1/2 cup dark corn syrup 1/4 teaspoon cloves 1/4 teaspoon allspice 1 teaspoon mustard seed 1/2 teaspoon celery seed 1 tablespoon salt 2 teaspoons fresh ground black pepper In a large heavy pot heat olive oil, over moderate heat, add onion and saute, stirring occasionally, until golden brown, about 8 - 10 minutes. Add garlic and cook another minute. Add tomatoes, vinegar, corn syrup, cloves, allspice, mustard seed, celery seed, salt and pepper, stirring to combine.
Bring mixture to a boil, reduce heat, and simmer, stirring occasionally, for 1 hour. Pass mixture through a food mill then return to pot.
Bring mixture back to a boil, reduce heat and simmer, stirring occasionally, until very thick, about 45 minutes.
Allow ketchup to cool. ketchup can be store in sterilized jars and kept indefinitely.
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