It's made from vinegar, molasses, anchovies, garlic, tamarind extract, sugar, salt, and chili pepper extract. “For me, a liberal amount of Worcestershire sauce makes all the difference,” said u/TRIGMILLION.
Adding some tomato to your stew adds a richness that can't be matched with anything else. You can cut up or mash fresh tomatoes to add to the pot, but using tomato paste, tomato concentrate, or other tomato-based products can be just as good.
Adding some parsley, oregano, basil, or thyme into your stew can really make or break the flavor. But simply tossing these ingredients on top of your stew won't do the trick — you should be adding them before your vegetables and meat.