Radish Greens Gratin

Steps

1. Wash the radish greens and boil them in salted water for 5 minutes. Drain and set aside.
2. Chop the onion and sauté it with the bacon lardons in a pan. Set aside.
3. Make a béchamel sauce: melt the butter in a saucepan, add the flour, and stir constantly for a few minutes. Gradually add the milk while whisking to avoid lumps. Bring to a boil, then remove from heat. Stir in the grated cheese until melted.
4. In a baking dish, layer the radish greens, the onion and lardon mixture, and the béchamel sauce. Top with more grated cheese.
5. Bake at 220°C (425°F) for 20 minutes.