Homemade Ketchup Ingredients 2 (28 ounce) cans peeled ground tomatoes 1/2 cup water, divided 2/3 cup white sugar 3/4 cup distilled white vinegar 1 teaspoon onion powder 1/2 teaspoon garlic powder 1 3/4 teaspoons salt 1/8 teaspoon celery salt 1/8 teaspoon mustard powder 1/4 teaspoon finely ground black pepper 1/8 teaspoon cayenne pepper 1/8