For the most part a burger is great by what you add to it. Condiments like ketchup, mustard, or barbecue sauce that give it a little extra flavor. Today we thought we would tell you about a burger that needs no condiment. The hamburger from the National Underground is cooked over an open flame and seasoned with a fantastic rub that gives it a flavor that puts ketchup and barbecue sauce to shame. Well maybe not completely to shame, but it is unique. The rub gives it a smoked and spiced taste that mixes perfectly with the fresh lettuce, tomatoes , and onions. Also each meal is served with their grilled seasoned potato chips. Go get you some of this delicious meal at the National Underground on Nashville’s lower Broadway.