They ate it, mostly as a status symbol. They'd carry it around with a small silver grinder to add it to their food. I'm not sure what was so bad about that, other than adding something worth a laborer's salary for a year on your food. Also, it contains myristicin which if one consumes enough in one sitting can sort of give a high - a really bad one with hallucinations that go in for 48h - don't try it, it can make you very sick.