A few extra (extraneous) kohlrabi thoughts:
They stay forever in your fridge, so if you have other stuff you need to get to or want to eat first, the kohlrabi will do just fine in the meantime.
Don't worry about size. There's no harm, no "woody center" with big kohlrabi's, and given the peel is lost, it's actually more efficient, I think, to use larger ones.
Kohlrabi are not roots but bulbous stems. The leaves, if sold too, are just as edible, cook like collards.
Essentially any cabbage recipe will work for kohlrabi, which is why most of mine end up as slaw.
Think Yiddish, Dress British - Advice of Evil Ronnie to me.