Remove the less beautiful leaves from the Brussels sprouts and cut them in half.
Boil them for 4 minutes in boiling water, drain, rinse for 30 seconds with cold water, and let them drain well, shaking them in a clean towel if necessary.
Place them in a baking dish.
Mix the cream with the zest, season generously with freshly ground pepper, salt, and nutmeg, and half of the finely chopped rosemary, pour over the Brussels sprouts, and mix again.
Combine panko, cheese, and rosemary and sprinkle over the Brussels sprouts.
Let it gratinate nicely for 25 to 30 minutes at 185 °C.
Tips
You can also prepare it the day before. Are you a fan of the Brussels sprouts bacon combo, you can also mix fried bacon strips under the Brussels sprouts.