1. Preheat the oven to 250°C.

2. Cut the chestnuts horizontally and place them on an oven tray.

3. Place the tray in the middle of the oven and bake for about 30 to 40 minutes until they are nicely baked through.

Optional: Fill a second tray with water and place it at the bottom of the oven: this steams the chestnuts: they might be cooked faster!