How to Make Homemade Ketchup

Have you ever wondered how to make homemade ketchup? if yes you're in the right place!  In order to make homemade ketchup all you need is
4 onions, chopped 4 garlic cloves, chopped 4 28-ounce cans whole tomatoes 1/ cup sugar 1 cup apple cider vinegar 1 teaspoon crushed cloves  1 teaspoon crushed allspice 1 cinnamon stick 1 teaspoons celery seeds 2 teaspoons dry mustard 1 teaspoon paprika Tabasco to taste Salt to taste
How To: 
In a heavy kettle cook onions, garlic, and tomatoes, covered, over moderately low heat, stirring occasionally until onions are very soft, about 40 minutes. Force mixture through a food mill fitted with coarse disk into a bowl.
In cleaned kettle stir together puree, sugar, and vinegar and simmer, uncovered, stirring frequently to prevent scorching, until reduced by half, about 20 minutes.
Tie cloves, allspice, cinnamon and celery seed in a cheesecloth bag and add tomato mixture with mustard and paprika. Simmer mixture, stirring, until very thick, about 10 minutes. Discard bag and season mixture with Tabasco and salt. Ketchup may be made 10 days ahead and chilled, covered.

Source