Near Beigang’s Chaotian Temple Mazu Temple, a local late-night favorite—Yi Lang Fried Mackerel Soup—has been serving dinner-to-supper crowds since 1960. Run today by second-generation owner Hsu Yi-lang, the shop’s signature “floating” mackerel fillets are coated in sweet-potato starch, poached until they bob to the surface, then finished with cabbage and an egg drop thickener; the result is naturally sweet, with hefty, springy chunks of fish. Locals rank it among Beigang’s top late-night bites. Also on the must-try list: velvety braised pork trotters and aromatic spare-rib rice. If you’re in town, swing by after dark and taste for yourself.