Authentic old Beijing candied haws are made of agar powder and glass chips, while agar powder accelerates the solidification of candied haws. Fragile glass is to prevent candied haws from melting.

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Agar powder is a kind of fucoidan extracted from red algae such as agar, which has been used in China and Japan for more than 300 years. Because of its special gel properties, it is widely used in food, medicine, chemical industry, textile, national defense, biological research and other fields, and is called "new products in East Asia" internationally.

Glass crisp is also called glass crisp, and the main ingredient seems to be alum. Its function is to make the syrup crystal clear after cooling, and add it to the boiled syrup to prevent softening and increase brittleness. It is mainly used in candied haws and Tang Hua.