It got mentioned over in bugs, but as it wasn't obvious where to split the conversation off from there, I'll post it here.
Bump the volume of cauldrons up. 30L just doesn't make sense for a free standing object. I have a stewpot that is almost as large that fits on my stove (though is really more for a commercial stove or portable gas burner). 50L would be better, 100 would be nice as it is same as a barrel. The size of the inventory that can be put in it should probably be bumped up a bit, too
Implement a portable clay cauldron that can go over a firepit that boils quickly for easy cooking. It might hold 10 or 20L of fluid, though, so would boil dry quickly, too. It probably doesn't need an inventory as the idea is for things that cook quickly from the crafting menu, not for items that boil over time such as morels.