Step 1

Put the celeriac in a deep pan, cover with water and add 1 tbsp salt. Cover with a lid and bring to the boil, cooking for about 20 mins until tender. Meanwhile, melt half the butter in a frying pan and fry the leek with a pinch of salt and pepper for about 10 mins until softened. Add the cavolo nero and a squeeze of lemon juice and fry for a further few mins until tender.

Step 2

Scrape the contents into a bowl and add a splash of olive oil to the pan. Fry the bacon and thyme until the bacon is crispy. Add the breadcrumbs and fry until toasted, being careful not to burn them.

Step 3

When the celeriac is cooked, drain and allow to steam in the colander for 1 min or so, then transfer to a food processor and lightly blitz until you have a fairly chunky mash. Add the cream and the rest of the butter, season with salt, pepper and a grating of nutmeg and blitz again. Check for seasoning, transfer to a bowl and fold through the cabbage and leek mix. Top with the crispy crumb and serve.