Using a sharp paring knife, carefully cut through the shell on the rounded side of each chestnut and score an X.
Place the scored chestnuts in the hot water and let sit for 1 minute.
Drain the chestnuts and pat them dry.
Put the chestnuts in a large bowl and add the melted butter; season with salt and pepper and mix and stir until thoroughly coated.
Transfer the chestnuts to previously prepared baking sheet and arrange them in a single layer.
Roast for 25 to 35 minutes, or until the peel begins to curl up and the chestnuts are cooked through. Roasting time will depend on the size of the chestnuts.