Dried yam refers to yams that have been specially dried to produce flour. This flour is commonly used in Nigerian cuisine to make dishes like amala, a thick and smooth dough served with various soups and sauces. Dried yam flour is made by peeling and slicing yams, then drying and grinding them into a fine powder. This flour is valued for its versatility and nutritional benefits, as yams are a good source of carbohydrates, fiber, and vitamins.