To prepare this dish gluten-free, use gluten-free egg noodles or serve the beef tips over mashed potatoes or rice instead. Ensure the condensed cream of mushroom soup, beef with onion soup mix, and red wine vinegar are certified gluten-free, as many commercial products contain wheat-based thickeners or additives. Always double-check ingredient labels to ensure suitability for those with gluten intolerance or celiac disease.