In 1213 BCE, the mummified nostrils of Pharaoh Ramesses II were stuffed with peppercorns, marking the first known use of black pepper in ancient Egypt and establishing a trade route that would stretch from the Malabar Coast of India to the Nile River. This single spice, derived from the dried fruit of the Piper nigrum vine, became so valuable that it was referred to as black gold and used as a form of commodity money. By the time of the early Roman Empire, the trade had become so lucrative that the Roman Empire sent a fleet of around 120 ships annually to India, timed to take advantage of the predictable monsoon winds. The Roman geographer Pliny the Elder complained in 77 CE that India drained the Roman Empire of 50 million sesterces every year, a figure that highlights the immense economic power of this small, wrinkled berry. The popularity of pepper was so profound that it influenced the fall of Rome itself; when Alaric, king of the Visigoths, besieged the city in the fifth century, he demanded 3,000 pounds of pepper as part of his ransom, a sum that underscores how deeply embedded the spice was in the economy of the ancient world.
The Vine That Climbed History
Black pepper is a perennial woody vine that grows up to 15 meters in height, rooting readily where its trailing stems touch the ground and climbing on supporting trees, poles, or trellises. The plant produces small flowers on pendulous spikes that lengthen up to 10 centimeters as the fruit matures, with a single stem bearing 20 to 30 fruiting spikes. The fruit is a drupe, about 1 centimeter in diameter when fresh and fully mature, which is dark red and contains a stone enclosing a single pepper seed. The vine thrives in soil that is neither too dry nor susceptible to flooding, growing best at elevations between 500 and 1,000 meters above sea level. Wild pepper once grew in the Western Ghats region of India, but deforestation has since limited it to more forest patches from Goa to Kerala. The cultivation process involves propagating the plants by cuttings about 30 centimeters long, which are tied up to neighboring trees or climbing frames at distances of about 2 meters apart. The plants bear fruit from the fourth or fifth year and then typically for seven years, requiring careful management of competing plants and regular watering during the dry season for the first three years.The Chemistry of Heat and Aroma
The spiciness of black pepper is due to the chemical compound piperine, which is a different kind of heat from that of capsaicin found in chili peppers. Black pepper contains between 4.6 and 9.7 percent piperine by mass, and white pepper contains slightly more, yet refined piperine is only about one percent as hot as capsaicin. The outer fruit layer, left on black pepper, also contains aroma-contributing terpenes, including germacrene, limonene, pinene, alpha-phellandrene, and beta-caryophyllene, which give citrusy, woody, and floral notes. These scents are mostly missing in white pepper, as the fermentation and other processing removes the fruit layer. The aroma of pepper is attributed to rotundone, a sesquiterpene originally discovered in the tubers of Cyperus rotundus, which can be detected in concentrations of 0.4 nanograms per liter in water and in wine. Pepper loses flavor and aroma through evaporation, so airtight storage helps preserve its spiciness longer, and it can also lose flavor when exposed to light, which can transform piperine into nearly tasteless isochavicine. Once ground, pepper's aromatics can evaporate quickly, leading most culinary sources to recommend grinding whole peppercorns immediately before use.