Sugar candy was a sweet food item typically made from crystallized sugar.
In 2347, seven-year-old Ro Laren was shown the true nature of Bajor's Cardassian occupation when she was given a piece of sugar candy by a Cardassian who led her to a room where she found her father, Ro Gale. For the next two hours, Laren was forced to sit and watch as the Cardassian questioned and tortured her father to death. (TNG: "Ensign Ro")