What’s in bottled ketchup? Tomato concentrate, vinegar, onions, garlic, corn syrup, mustard, salt, cumin, allspice and cinnamon. It has a flavor that starts on the tip of your tongue with salt, moves to the side with sour notes and then hits the back of your tongue with a punch of umami. Deceptively complex, it is a condiment that cannot be replicated at home. Make a tomato sauce if you want to, but don’t call it ketchup unless you have the secret recipe from Heinz.