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Peel the celeriac and coarsely cut it into chunks. Peel the waxy potatoes too and coarsely cut them too into chunks. Add the pieces of celeriac and potato into a large pan.
Fill the pan with water, add in a pinch of salt and bring to a boil. Wash the green cabbage and slice it into smaller pieces. Peel the onions and finely dice.
Add the sliced green cabbage into the large pan when the celeriac and potato pieces are almost fully cooked. This is within the last 10 minutes.
Cook the (diced) bacon in a large skillet. Add in the onion for the last couple of minutes.
Drain the pan with potatoes, celeriac and green cabbage and mash it using a potato masher. Add in the fried bacon bits, make the mash creamier with a knob of butter, a splash of cream and a splash of milk.
Mix everything together and season with salt, pepper and a big pinch of nutmeg. Enjoy your meal!