1. Grate the sheep cheese
2. Peel and finely chop the garlic and onion. Peel the potatoes. Peel the potimarron or bake it in the oven at maximum temperature for 30 minutes to 1 hour, depending on the size.
3. Sauté the garlic and onion in 2 tablespoons of olive oil.
4. Add the quinoa, gently stir everything for 5 minutes, until the ingredients have a slightly golden color.
5. Pour in the white wine and continue cooking over low heat until the liquid is completely absorbed, cover and set aside.
6. Cook the potatoes and potimarron (if you have peeled it) in salted water for 20 minutes.
7. Make a mashed potato and potimarron mixture.
8. Add a whole egg, a pinch of nutmeg, and the milk (adding it gradually to check the consistency). The mixture should resemble cake batter (not too thick).
9. Place the quinoa in a gratin dish.
10. Carefully pour the potimarron puree on top, making sure not to let the quinoa grains come to the surface.
11. Sprinkle with grated cheese or drizzle with olive oil.
12. Bake in a hot oven for 15 to 20 minutes.