1 med. onion...2 jalapenos...4 T. butter, divided...1 lb. hamburger...2 T. Worcestershire sauce...1 T. liquid smoke...1-1/2 oz. pkg. taco seasoning mix...Monterrey Jack or Swiss cheese...Hamburger bun...banana peppers Gourmet Burgers, Burger Bar, Burger And Fries, Beef Burgers, Burger Recipes, Mexican Food Recipes, Dinner Recipes, Mini Burgers, Veggie Burgers