In South Africa, a rusk is a traditional biscuit (called beskuit in Afrikaans) that is eaten after having been dipped in coffee or tea.
Historically, rusks evolved (along with biltong - dried meat similar to jerky) during the country's early pioneering days as a way to preserve bread in the dry climate. It was also extensively used during times of war or when traveling long distances.
South Africans enjoy Rusks for breakfast, but rusks are also a typical afternoon tea snack. The correct way to eat rusks is by dipping them in a cup of hot tea or coffee - this is essential to experience the full flavour of the rusk.