Can someone from Hainan explain what this is???

We found this old restaurant in Qionghai, recommended by locals. It's been open for almost 30 years, so it must be good. It's always full at mealtimes, no exaggeration. − 🐈Recommended dishes: 🔸Signature Fruitwood Roasted Hot Spring Goose A must-try in Qionghai, the hot spring goose is air-dried and roasted, with crispy skin and tender meat. The sizzling goose skin is fatty but not greasy, and you can't stop eating it. · 🔸Stone Plate Wild Vegetable Tofu Homemade wild vegetable tofu is served on a steaming stone plate. The crispy outside and tender inside, with a hint of wild vegetable aroma, is irresistible. · 🔸Radish and Pig Lung Soup with Nine Orange Root The soup is sweet and refreshing, with a hint of dried tangerine peel and some pepper. It's perfect for warming you up in cold weather. · 🔸Stone Plate Fresh Taro Stems Fresh taro stems with shrimp paste are delicious and go well with rice. The stone plate keeps the dish warm, and the steaming hot dish is very tempting. − 🥢Fuxiaoguan Hot Spring Goose, 30 Years of Hainan Cuisine (Qinwang Branch) 📍400 meters southeast of Dongwenquan Health Center, National Highway 233, Fuxiaoguan Hot Spring Goose Restaurant (formerly Qinwang Goose Restaurant)