Easy to grow and store, high-yielding, supernutritious and crunchy like an apple, yacon root (pronounced ya-kon) is one of the many “new” vegetables coming to us from South America.  In reality, this fruitlike vegetable has been cultivated throughout the Andes for more than a millennium.  South Americans eat it as a fruit; they also use the huge leaves to wrap foods during cooking, in the same way cabbage leaves are used in Germany, grape leaves in the Mideast and banana leaves in the tropics.  Only recently – thanks to some adventurous green thumbs – have North Americans begun to see yacon…