This vegetable definitely tastes like celery with a hint of parsley.
We tried it raw, and it tases like celery. It would be a conversation piece on a veggie tray with dip.
On its own, a small amount is enough.
Mixed into mashed potatoes was nice.
We boiled the celery root which had been diced into cubes exactly like the potatoes. We mashed them with the potatoes and added milk butter and onions just like we always do.
They add a very faint flavour to the potatoes.
HINT: when shopping for one, look for hard bulbs, no soft spots. We found ours at The Superstore.