in my youth worked at a salad bar for almost a year, dressing pots are always nasty. policy was to replace them when low, but way easier just to dump more in, so end up with some freaky looking nastiness in the bottom.
he has a 25 part series on building it and sells plans for $95
he said would been over $13k with all new parts a few years before covid and china tariffs. wonder how much that would cost to build today.