Step 1

Preheat the oven to 200°C / fan 180°C / 400°F / gas mark 6.

Step 2

Peel the celeriac, then cut into about 3cm (1½in) cubes.

Step 3

Arrange the celeriac cubes in a single layer on top of a baking sheet and brush with oil.

Step 4

Roast in the oven for 15 minutes, then stir and bake for another 10 minutes. The cubes should be browned and fork tender. In case the celeriac isn’t cooked, roast it a few more minutes in the oven until a fork enters with ease.

Step 5

Tip the cooked celeriac cubes into a food processor, along with the butter, milk, double cream and onion powder. Process until smooth.

Step 6

Season to taste and serve as a side dish. Enjoy!