Maybe it's this rough exterior that makes this seasonal root vegetable so seriously underrated! We're going to be showing celery root a little love this week in this delicious celery root and apple soup recipe that will hopefully make you fall in love with this unique root vegetable. If you've never cooked with celery root before — this is your time. This light, fragrant celery root soup is a beautiful way to introduce yourself to this ingredient and the sourdough thyme croutons add a nice crunch of texture to this seasonal soup.