Homemade Tomato Ketchup

• 3 tablespoons olive oil
• 3 cups onions, coarsely chopped
• 3 garlic cloves, minced
• 3 lbs plum tomatoes, coarsely chopped
• 1/3 cup distilled white vinegar
• 1/2 cup dark corn syrup
• 1/4 teaspoon ground cloves
• 1/4 teaspoon ground allspice
• 1 teaspoon mustard seeds
• 1/2 teaspoon ground celery seed
• 1 tablespoon salt
• 2 teaspoons black pepper

1. In a large heavy pot heat the olive oil over moderate heat and cook the onion until golden brown, stirring occasionally, about 8 to 10 minutes. Add the garlic and cook for another minute.
2. Add the tomatoes, vinegar, corn syrup, cloves, allspice, mustard seeds, celery seeds, salt and pepper stirring to combine. Bring the mixture to a boil, reduce heat and simmer, stirring occasionally, for 1 hour.
3. Pass the mixture through a food mill (or cheesecloth) into a bowl and return to the pot. Bring the mixture back to a simmer and cook until very thick, stirring occasionally, about 45 minutes. Allow the ketchup to cool.

olive oil, onions, garlic, tomatoes, white vinegar, corn syrup, ground cloves, ground allspice, mustard seeds, ground celery, salt, black pepper

Taken from www.food.com/recipe/homemade-tomato-ketchup-265063 (may not work)