Celery root, also called celeriac, is a knobby, round root vegetable with a sweet taste and somewhat crunchy, firm texture. You might not be familiar with it, but you should be! Most will be very knobby and even dirty, and you have to be a bit aggressive with peeling. Underneath is a creamy colored vegetable that works well roasted, in soups and even in salads. It is the basis for the classic French Celery Remoulade. Monash has lab tested celery root and it is low FODMAP in 75 g amounts.