To ensure that this recipe is suitable, for those with gluten sensitivities make sure to use Worcestershire sauce and beef bouillon cube that are certified gluten-free. Choose a gluten-free all-purpose flour, for coating the beef and a gluten-free cornstarch to thicken the gravy. By making these substitutions you can savor the taste of Beef Tips With Mushroom Gravy while accommodating a gluten-free diet.