unless some french speaker corrects me, I pronounce it 'jah-DOOP'.
The 'j' sound is hard to describe. it's sort of an in-between of
'sh'
from 'show' and 'y' from 'you'. Try it and you'll get pretty
close.
if that's too hard for you (and I understand it can be), just saying
'yah-DOOP' will work pretty well. The point is making it clear that you
don't want to move that piece.