In the same way, cook the beetroot in salted water (approx. 30 minutes).
Peel both the potatoes and the beetroot and cut them into thicker slices (about 1/2 cm thick), layer them in a baking dish.
Mix the cream (you can also use a part of milk to make the whole thing easier!) With the garlic, season with salt and pepper, pour over the vegetables. Sprinkle with grated cheese and bake in the oven at 220 degrees until the cheese is brown.