What is "ogwacha"

Ogwacha is a traditional Korean tea made with walnuts, chestnuts, Gingko seeds, jujubes, gotgam (dried persimmon), and ginger. It is known as a good remedy for people who frequently get a flu and cough. In the name, the ogwa refers to "five fruits" in Korean while cha means "tea،" although the beverage is not made from Camellia sinensis.