Back cover artwork taken from the print copy of Cook's Illustrated's Home Entertaining. There are hundreds of different varieties of olives, but all can be categorized by two factors: their ripeness when picked and the manner in which they are cured. Green olives, picked before they are fully ripe, tend to have fruitier and somewhat lighter flavors. While ripe olives ~ which range in color from dark brown to purple to deep black ~ have deeper, more developed flavors. Most olives are…