Crispy-bottomed Shanghai sheng jian bao are pan-fried soup buns with juicy pork filling. A high protein, family-favorite street food with fresh, bold flavors.
Combine flour, yeast, and lukewarm water in a large bowl, mixing until a shaggy dough forms. Knead for 8–10 minutes until smooth, then cover and let rise in a warm place for 1 hour.
While dough rises, simmer chicken broth and stir in gelatin until dissolved. Chill for 30 minutes to set, then cut into small cubes for soup filling.
In a separate bowl, mix ground pork vigorously with soy sauce, Shaoxing wine, sesame oil, sugar, salt, and white pepper until sticky. Fold in chopped scallions and chilled broth gelatin cubes.
Divide risen dough into 12 portions. Shape each into a flat disc, add pork filling and soup gelatin, then pleat and seal buns tightly to prevent leaks.
Heat a lidded nonstick pan over medium heat with neutral oil. Place buns seam-side down, fry for 3 minutes until bottoms are golden, then add 1/3 cup water. Quickly cover and steam for 8–10 minutes until water evaporates and bottoms are crisp. Remove lid to finish crisping for 2 minutes. Serve hot.