Thai cuisine is one of the most popular in the world. Thai food blends five fundamental tastes: sweet, spicy, sour, bitter, and salty. The herbs and spices most used in Thai cooking themselves have medicinal qualities such as garlic, lemongrass, kaffir lime, galangal, turmeric, coriander, coconut milk.  Each region of Thailand has its specialities: ''kaeng khiao wan'' (green curry) in the central region, ''som tam'' (green papaya salad) in the northeast, ''khao soi'' in the north, and ''massaman'' curry in the south.