Adapted from Living Nordic Life

In a dutch oven or other large stewing pot on medium high heat, add the oil and butter and heat completely through. Add the chicken with salt and pepper and cook for 4-5 minutes until browned on one side, flip and cook until browned on the other.
Turn the heat down slightly and add the onions, cooking for 7-10 minutes until they start to color and moving only enough so they do not burn.
Add the parsnip, celeriac, rudabega and carrots then cook the entire mixtures for 5-6 minutes. If it sticks to the pan you can simply add a small amount of water to release.
Once the vegetables are slightly sweated, add the flour, cook for about 60 seconds until it is no longer raw and then add all of the stock. Allow to cook at a simmer for 30 minutes until the vegetables become very tender and the stew thickens considerably.
Add the leeks to the stew and cook for another 7-8 minutes until they completely wilt then adjust seasoning to taste and serve hot.
4 servings
a large bowl