You get to choose your broth you want to use in your hot pot. You can also choose a meat, but you don't have to because they have other choices in the buffet and , you might be a bit too full depending on how much you eat. So be mindful not too waste anything.
After that, you go and pick all the veggies, noodles, etc. to cook in the pot yourself ! You basically steam all your food you bring back to the table. It's a great way to ensure no one is doing any funny stuff to your food.