No, lemons are not man-made. They are natural citrus fruits that have been cultivated for thousands of years. Lemons are believed to be a hybrid between a sour orange and a citron, and they originated in southeast asia. In ancient times, lemons were valued for their medicinal properties and were later introduced to europe by arab traders. Today, lemons are grown in many parts of the world and are a popular ingredient in culinary and cosmetic products.