Pat fish belly pieces dry. Marinate with Shaoxing wine, light soy sauce, white pepper, and cornstarch for 10 minutes.
Heat cooking oil in a wok over high heat. Pan-fry the fish belly pieces in batches for 1-2 minutes per side until lightly browned. Remove and set aside.
In a claypot or a deep pot, add cooking oil. Sauté ginger slices and half of the spring onion lengths until fragrant (about 1 minute). Add diced bell peppers if using.
Return the pan-fried fish belly to the claypot. Pour in chicken broth, oyster sauce, light soy sauce, dark soy sauce, sugar, and white pepper.
Bring to a simmer over medium heat, then cover and cook for 8-10 minutes until the fish is cooked through and flavors are melded. Add the remaining spring onion lengths during the last 2 minutes.
Drizzle with sesame oil before serving hot in the claypot.
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