How I uncovered a potential ancient Rome wine scam

Before artificial sweeteners, people satisfied their cravings for sweetness with natural products, including honey or dried fruit. Raisin wines, made by drying grapes before fermentation, were particularly popular. Historical records show these wines, some known as passum, were enjoyed in the Roman Empire and throughout medieval Europe. The most famous of raisin wine of the period was Malmsey, with varieties of this type produced across the Mediterranean.