[header] How to grate nutmeg [title] Purchase a microplane zester/grater. [step] These stainless steel kitchen utensils have sharper edges than regular zesters or graters and they are ideal for grating hard spices like nutmeg and mace. [substeps] If you don't have access to this type of zester, use a nutmeg grater or a small zester. 
You need a very sturdy grater with small, hard holes to adequately grind the hard seed. [title] Buy a jar of whole nutmeg seeds.