Preheat the oven to 425°F (220°C)
Rinse and dry the chestnuts
Cut an X into the flat side of each chestnut
Place the chestnuts in a bowl of water for 10 minutes
Drain and pat the chestnuts dry
Spread the chestnuts on a baking sheet, cut side up
Roast for 20 to 25 minutes
Remove from the oven and let cool slightly
Peel the shells and inner skins while warm
Serve warm