Harbor Mackerel Geng. Harbor Mackerel Geng uses traditional methods combined with innovative techniques. The fish is crispy, sweet, and leaves a lasting flavor. The broth, made with secret ingredients, is smooth and refreshing. Harbor Mackerel Geng uses traditional methods combined with innovative techniques. The fish is crispy, sweet, and leaves a lasting flavor. The broth, made with secret ingredients, is smooth, refreshing, and not greasy. There are currently many franchise stores nationwide, and its fame has spread far and wide. Address: 臺南市安定區港南村151號 Hours: 00:00–23:59 Tainan