Having realized I lived in China for around six months without eating hotpot, I decided we should eat hotpot before we left the country. We went to a reputable chain, Dollar Hot Pot.
The bulk of our order is shown in this picture: regular hotpot broth (center), tofu sheets (top-right), mixed leafy vegetables) (cabbage, spinach, and something else) (top-left), and lamb rib rolls (left). The standard sauce in the square plate at left was a pleasing mix that included soy and something herby. (It wasn't complex but I forget the details.) As for the sauces at the bottom, see the next picture.