A deliciously easy Onion gravy made with slow-cooked sweet caramelized onions, a touch of mustard, and fresh thyme. This tasty gravy is delicious over mashed potatoes, pan-fried chicken, hamburger patties, Yorkshire Pudding, or bangers and mash. If you love onions this is a must try and one hubby would eat every night if I fixed it. A simple yet delicious caramelized Onion Gravy made with 9 simple ingredients. Add flavor to bangers (sausages) and mash, chicken fried chicken, pork schnitzel, hamburger steak, and so much more.