They're simple to roast. They're best when super soft and just melt in your mouth. The best way to accomplish this is to boil the nuts before roasting or to simply pressure cook them. The unique meaty flavor of roasted chestnuts is perfect for cozy gatherings around the fireplace. In terms of nutrient value, chestnuts are closer to a starchy vegetable than to a nut. This is important to keep in mind when putting together your meals. To prepare the chestnuts, thoroughly rinse them and then score the rounded side in an X pattern. Your cuts should go about halfway through the nut.