Old paka" is a common drink in the Yunnan tea-producing areas and originally not for sale. 
It is made from the old leaves by heating.  The heating process for making old paka differs from making Pu'er tea. The leaves are boiled to deactivate the enzymes in the leaves. After the leaves are withered, they are laid out to dry. The dried leaves are old paka ready to brew. 
Before making tea, it is better to roast the old paka for some time so as to release its fragrance. 
Like huangpian, old paka is very popular with the local people for its special fragrance and sweet flavor. It is an indispensable daily drink in the tea producing areas.