Bring the carrots, onions and garlic to the boil in the vegetable stock and simmer for about 10 minutes. Then add the potatoes, stir and continue to simmer on a low heat until the potatoes are cooked. Pour off the broth except for a small remainder.
In a small pan, mix the butter and flour into a butter roux and use it to bind the vegetables. Simmer again briefly. Season to taste with salt and pepper.
The dish is suitable both as a vegetarian main course, but also as an accompaniment to meatballs or fried black pudding or or or.