See the recipe here: https://www.greatbritishchefs.com/recipes/char-siu-pork-belly-breakfast-bao-recipe

This bao sandwich recipe sees the steamed buns packed with charred pork belly smothered in Lee Kum Kee Char Siu and Oyster Sauces, scrambled egg and a smoky tomato relish – a delicious Chinese take on British egg and bacon sandwiches. For best results, give the pork plenty of time to marinate – the char siu will imbue the meat with a sweet, salty stickiness that works perfectly with the savoury kick of the oyster sauce