The Sally Lunn is the New Zealand name for the Boston Bun, so called in Australia. They are one and the same in using mashed potato and raisins or sultanas in the bun and topped with an icing finished with a coating of desiccated coconut. The British Sally Lunn bun is not the same as the New Zealand or Boston Bun in that it more closely resembes a brioche, therefore, would include butter in the dough.