Yes, 3 1/8 oz ginger; I assumed that 2" x 1" meant 2" long by 1" diameter, and although I confess I didn't use a vernier caliper, I think I was reasonably close. The 5 cloves garlic seemed very little to me, even though I chose largish cloves, but the ginger looked "about right" in proportion to other things. Perhaps one useful than might come out of this exercise is if we re-publish the original recipe with additional suggested weights.
** Phil.