Worcestershire Sauce- Yes this is gluten-free if stated on the bottle (i.e. Lea and Perrins manufactured in the US). If you want to keep this vegetarian, try gluten-free tamari soy sauce instead.

Rice is the most common (and gluten free), but barley is also used, which is the one to look out for. You don't need to know how to pronounce it to know what a great addition Worcestershire sauce ...