Rocky road is a type of no-bake slice made up of milk chocolate and marshmallows along with other ingredients, which tend to vary by country. In British influenced areas it was previously referred to as 'Tiffin' but the Australian/American name has now come to predominate in the UK. It is usually served in individual portions such as a brownie, or in American cuisine, as an ice cream flavor.
It is made by mixing melted chocolate with other ingredients, before refrigerating to set. It can then be cut into bars or square pieces.