Combine all the ingredients in a medium saucepot and stir it.
Set the burner to medium heat and bring the mixture to a boil, make sure to stir frequently. Give it a taste with a spoon (make sure to blow on it, beforehand) then add additional sugar and any other spices as desired. You could also add more corn syrup. Once the ketchup comes to a boil, reduce the heat to low and then let it simmer for 20 to 25 minutes until it thickens. Stir it occasionally. After simmering, remove it from the heat, cover it with a lid, and allow it to cool to room temperature. This will take 45 minutes to an hour or so.⏱ 25 min
Pour the ketchup into a mason jar or you can use an empty ketchup bottle. Then place in the fridge to chill. It will thicken even more as it cools. Now it is ready to use!
Eat it with fries or whatever you need it for.