Back to roasted garlic for a bit:
I seperate, but don't peel.
Make a little slit at the bottom (root) end and throw in the pan when frying bacon, pork chop or whatever.
They are ready when the meat is done. Just press at the top end and the garlic smurry comes out easily.
Coriander, to me, would be the seeds. Coriander leaves, obviously, the leaves and coriander root, the (guess what) roots.
Nice thing is you can eat the whole plant.
Cooking terms: I suppose when targetting new cooks, things should be specified.
By all means use "cook till done" for more experienced cooks, but then state something like: use a fork, knitting needle or whatever to check.if the potatoes are soft on the inside (or whatever else I can do to know it's "done")