Fritz’s Pub, located at the corner of Oklahoma Avenue and 20th Street (3086 S. 20th St.), may look like just another corner tavern, but locals know that Fritz’s stands out for its food. You’ll find daily soups, burgers and a decent corned beef sandwich, but the best things here are Serbian. The Fritzburger is a half-pound of ground beef and veal with Serbian spices—one of the best bar burgers in Milwaukee. The chewaps, a shortened and easier-to-pronounce form of chevapchichi, are grilled sausages served on a platter with grilled onions, a big piece of bread and a slice of feta cheese. The smaller serving should be enough for most appetites. The house specialty is bureks (served slightly smaller than the norm). The spinach and cheese burek is always good. Dine in or order a frozen one to go. Fritz’s has a “For Sale” sign outdoors and operates under “retirement hours,” which means the place closes at 8 p.m. Visit before the building is sold and another South Side classic disappears.