Freeze drying is a method of dehydration of frozen materials by sublimation under vacuum, and it could produce the high-quality dried foods. However, its major problem is the long drying time needed, which in turn leads to high energy consumption and high capital costs. Drying food in the sun is a safe and economical way to preserve food, especially plants and animals. To dry food in the sun, one needs to have both warm temperatures and a constant breeze. Drying food in the room is different from sun drying. Here the food that has to be dried is placed in a well-ventilated room or covered space. In microwave drying, drying time is shortened due to quick absorption of energy by water molecules, causes rapid evaporation of water, resulting in high drying rates of the food. Drying could lead to changes that might improve the herb quality such as appearance and aroma due to the loss of volatile compounds or the formation of new volatile compounds through esterification or oxidation reactions (Hossain et al., 2011).