A great question Tim but Brody is the master of experiment you may have to expect an answer your weren't prepared for, just a warning to you.
He probably used mild cheddar and left it in the firms bog till it formed a crust, then cast in acrylic, ground it to a powder and subjected it through water vapour to 40,000 volts at the power station which crystallised it.
Sprayed the whole blank with the resulting liquid when mixed with cellulose lacquer, through a portaflek gun then turned it leaving just a ring of crud in the pre-made recess.
That's our Brody init?
Love im.