Charcoal. Charcoal for grilling uses hard woods such as oak, maple, birch and beech. These woods have a high density, high calorific value, and a long burn time, making them ideal for use in making charcoal. Charcoal is burned until a white ash is produced on the outside and the fire is not as hot as it could be when it is ready to grill. Grilled corn, pay attention to the skin of the corn do not pull out all, so that the grilled out more tender, if you want to burnt some, wait for the corn with the skin grilled to almost cooked and then peeled and grilled.