Most northerners are agriculturists -- farmers and gardeners. Products of this part include rice, soyabeans, pepper, garlic, cabbage, tomatoes, etc. Apart from these, miang (wild tea) and tea trees are also widely planted. Miang leaves are usually steamed, tied into bunches and then left to ferment. The northerner likes to keep miang leaves, which have been thus treated and with salt added, in the mouth after a meal to enjoy the taste and to prevent bad breathFruits are also widely planted in this part, including lichees, longans, apples, strawberries, etc. There is a kind of food processing industry which turns pigskin into a delicacy called nang pong. It is eaten with khanom chin (Thai vermicelli) or nom phrik ong (northern style chilli dip). Apart from this, naem or chin som (pork & rice fermented in salt) is also produced and is much in demand by tourists from Bangkok and elsewhere.