Celeriac Mash with Scallop Roe Butter is a delightfully fluffy side dish where nutty, celery-flavored celeriac combines beautifully with gorgeously buttery coral scallop roe.It’s not a pretty vegetable – in fact, some would say it’s downright ugly - and perhaps that’s why celeriac is underrated. I like to use it in soups where it adds a delightfully subtle celery flavor and welcome creaminess,