A rusk is a rectangular, hard, dry biscuit or a twice-baked bread (zwieback, biscotte). It is sometimes used as a baby weaning food. In the UK, the name also refers to a food additive. See also Milk toast, the modern store-bought forms of which strongly resemble rusks with slight flavouring and sweeteners. South Africa In South Africa, rusk is a traditional biscuit (called beskuit in Afrikaans) that's eaten after having been dipped in coffee, tea, or rooibos tea. Historically, rusks evolved (… (More on Rusk)