Why is it wrong for Colombian milkberries to make coffee with their hands? how to make coffee with multiple hands?

Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style) □ production area: Northern region of Nario □ producer: regional small farmers □ altitude: 1800 □ varieties: Caturra,Castillo,Typica □ treatment: washing □ grade: Supremo □ flavor description: very elegant acidity, caramel, light fruit, light flower fragrance