A few thoughts on hotpot sauces
While it's easy find lists of ideas of what to cook in your hot pot and plenty of broths including mushroom, tomato, curry beyond the common sichuan/chengdu varieties, there's less info about mixing up sauces.
A hot pot restaurant usually has a section for customers to build their own sauce. So lets list some of the common items and some notes on their prep before building a sauce.
The two big pots are usually:
Sesame Sauce--this is thinned out sesame paste, normally with just water. And it is a bit of pain to mix sesame paste and water but patience is the key. Just keep stirring. Usually 1::1 to 1::2 ratio. You can use other liquids of course too.
Shacha Sauce is a fermented sea food in oil. Commonly Bullhead brand. Briny, complex and oily. Be sure to stir it up as the solids settle to the bottom.
Lesser players, not in flavor but usually a smaller container:
Leek Flower Sauce/Chive Sauce, I've seen recipes, but just buy it. I've only ever seen two brands, but usually it's just WangZhihe. This is salty, somewhat vegetal-onion and a hint of floralness.
Red Fermented Tofu/Fu Ru You might see this blended smooth- the tofu cubes and the liquid from the jar. Or cubes in red liquid. If you've got cubes, be sure to include a little liquid too. This is a sort of blue cheese like tofu flavor.
chopped garlic, usually in a liquid. Drain off the liquid if you can.
Soy Sauce, this is often the salty element of your sauce and you do need some saltiness.
Black Vinegar, flavor will vary with the region its from, but sort of balsamic vinegar with some vegetal/medicinal overtones. Kong Yen brand from Taiwan is mellow and vegetal.
Sesame Oil
Chili Oil and possibly some other chile sauces or even fresh chiles.
Chopped cilantro
Chopped green onion
salt
sugar
A classic sauce mix is three parts sesame and one part leek flower sauce. That's it. This is my wife's preferred sauce
I prefer a base of sesame sauce, say two parts. Then 1 part sha cha. 1/2 part fu ru. 1/2 part each soy and black vinegar. then garlic, cilantro and green onion according to my mood. Sometimes I add 1/2 part Leek Flower Sauce according to mood as well, but that's less common for me.
If you pick up any of the less common ingredients like Sha cha, you'll find recipes like Sha Cha beef, Sha Cha Chicken, Sha Cha noodles. Mostly from Taiwan and the Fujian region for recipes.
Sesame paste shows up here and there, but is quite good in cold applications as a sauce again on cucumbers and that sort of thing. Some people use tahini which is a little less intense flavor so they don't have multiple sesame sauces around.
Fu ru I see in marinades and finishing sauces. All of these keep well refrigerated.