To make authentic Chengdu-style hot pot, start by preparing a rich base stock by simmering pork, chicken, or beef marrow bones with ginger and scallions for several hours until the liquid becomes opaque. The soul of the dish lies in the spicy "ma la" base, created by sautéing aromatics like ginger, garlic, and scallions in a combination of beef tallow and roasted rapeseed oil. Incorporate essential Sichuan ingredients, including Pixian doubanjiang (chili bean paste), fermented black beans, and a generous amount of dried red chilies and Sichuan peppercorns to achieve the signature numbing heat. For depth, add a blend of whole spices such as star anise, cinnamon, black cardamom, and fennel seeds, often steeped in Shaoxing wine before frying. Once the aromatic paste is fragrant and deep red, combine it with the prepared stock in a divided or shallow pot and bring to a boil. To serve, place the pot on a portable stove in the center of the table and provide a variety of thinly sliced meats like beef and lamb, offal such as tripe, fresh vegetables, and mushrooms for dipping. Complete the experience with a traditional dipping sauce made primarily of toasted sesame oil and minced garlic, which helps to mellow the intense heat of the broth.