Wash and rub chestnuts in cold water, discard any chestnuts with signs of spoilage.
Using a small sharp knife or Italian Chestnut Knife make a long slit cut across the rounded side of a chestnut trying not to cut too deep into the nut.
Dip scored chestnuts in a bowl with water.Repeat the process with remaining chestnuts.
Let chestnuts soak in water for 1-2 hours.
Roast chestnuts
Preheat oven to 400F (200C). Static setting (fan off).
Drain the water and arrange chestnuts in a single layer on a baking sheet. Check that all chestnuts are scored and placed cut side up.
Roast chestnuts in a preheated oven for 25-40 minutes. It might take a little more or less time depending on the size and quality of the chestnuts.Take one chestnuts out from the oven at 25 minute mark and adjust cooking time as needed.Chestnut if fully cooked when it's soft to bite.
Once cooked, wrap chestnuts in a slightly damp kitchen towel and let rest for 10-15 minutes before peeling.
Video
Notes
If you like a combination of sweet and salty, sprinkle chestnuts with salt after arranging them on a tray or right before wrapping roasted chestnuts in a towel.Turn on the grill (broil) for the last 5 minutes to slightly char the chestnut shells mimicking the fire-roasted ones (optional).