Chestnut coating is a type of food preparation that involves coating food in a mixture of chestnuts and other ingredients. The term 'chestnut coating' is often used to refer to the process of coating food with a mixture of ground chestnuts, butter, sugar, and spices. The resulting coating is usually sweet and crunchy. The crossword solution for the term 'chestnut coating' is BUR, which stands for 'browned, unseasoned, roasted'. This refers to the process of roasting the chestnuts before they are ground and mixed with the other ingredients.