Peel and cut the potatoes into large cubes. Place them in a pot, cover with water, and add a small pinch of salt. Bring to a boil and cook for about 20 minutes until the potatoes are soft.
While the potatoes are cooking, cut the broccoli into florets and wash them. Cook the broccoli in boiling water until tender, then drain and set aside.
Slice the mushrooms and place them in a pan over medium heat. Cook for a few minutes until they release their moisture and soften.
Wash the green part of the leek and chop it finely. Peel the beetroot and cut it into small cubes.