1. Peel if necessary, then cut your beets into slices about 0.5cm thick.
Peel and slice the onions.
2. Melt the butter in a large skillet, then arrange the onions and beets.
Sauté for about 5 minutes.
3. Sprinkle with flour and let cook for another 2-3 minutes.
4. Add the sugar, salt, pepper, a glass of water, then bring to a boil.
5. Cover, reduce to medium heat, and let cook for about 20 minutes, until the beets are very tender.
6. Tips:
- Side dish: For vegetarians, this goes very well with green or blonde lentils. Otherwise, prefer a meat accompaniment.