If you’re using an ice cube tray, spoon 1 tablespoon of ginger into each compartment. Measuring it this way will give you exact amounts the next time you need it.
I used egg-shaped molds. My daughter and son are sleeping, so I’ll need to catch up to warn them: if they think it’s candy, I will surely lose my “best dad ever” award (I have coffee mugs and other evidence to how deserving I am of this honor).