Welcome to Gronk's Grill & Bar! The southern gateway to the city of Superior! Home of large mouth burgers and sandwiches, the world famous upside down burger, and a 22 beer bottoms up tap system! Stop by and visit us today!Welcome to Gronk's Grill & Bar! The southern gateway to the city of Superior! Home of large mouth burgers and sandwiches, the world famous upside down burger, and a 22 beer bottoms up tap system! Stop by and visit us today! .