 
            Jiaduobao (Mandarin pronunciation) is a popular brand of herbal tea, made from water, sugar, chrysanthemum, licorice, and other ingredients, and sold in recognizable red cans.
It was known as wanglaoji (wang lo kat in Cantonese), but after a trademark dispute has since been marketed under the company name and competes with wanglaoji, which is sold in green boxes. It's kind of like the cola wars.
In Hong Kong, I used to buy a can daily from the vending machine in my corporate apartment, and it had the option of warming up the can for a nice warm tea before rolling it out.