Easy

unit

2 min.Slice the onions.

5 min.Melt them in butter.

5 min.Rasp the 4 zucchinis with the skin.

1 min.Add them to the onions.

1 min.Preheat the oven to 200°C (Th. 6/7)

1 min.Combine the grated Gruyere, eggs, cream, and salt and pepper.

15 min.Put the zucchini in a dish and pour the sauce over it and bake in a hot oven for 15 min.