Edinburgh rock is a traditional Scottish confection. It consists of sugar, water, cream of tartar, including colourings and flavourings. It is formed into sticks and has soft, crumby texture. 

Edinburgh rock was first made in the 19th century by a man named Alexander Ferguson, who became known as Sweetie Sandy. It is said that one day he came across a tray of sweets that had lain forgotten for months. He tried a piece and found it delicious, and so Edinburgh rock was born.