A rusk is a hard, dry biscuit or a twice-baked bread. It is sometimes used as a baby teething food. In the United Kingdom, the name also refers to a wheat-based food additive.Popular in Crete and often served as an appetizer, dakos is a Greek food made primarily of cheese, tomato, and bread rusks, a kind of twice-baked bread similar to bruschetta. Traditionally, a dakos consists of a bread rusk topped with the tomatoes and cheese, and sometimes served with a side of olives. Ingredients may also be combined into a bowl, however, and served as a bread salad.