MARGILAN, Fergana Valley: Strung into garlands, hung above doorways, walls, and crafted into traditional textiles and ceramics, red hot chili peppers are a distinctive ornament in Uzbek culture: a legacy of ancient beliefs that made them amulets against the evil eye and demons. Chilies most likely arrived in Central Asia from China, brought by spice caravans that traveled the Silk Road — the ancient trade network that for hundreds of years linked East Asia with the Middle East, Africa, and Europe.