2. Rock sugar will be soluble in water, and most minerals and vitamins in pears will also be soluble in soup. However, pear meat also has residual nutrients, so it is recommended to eat it all in order to get more comprehensive nutrition. Rock sugar, also known as ice particles, is a large crystalline sugar made from sucrose and protein through redissolution, cleaning and recrystallization. Sydney, pear name, is a common fruit, because its meat is as white as snow.