It’s a bit of a mystery — Gaspare Campari, the liqueur’s inventor, was a 19th-century Italian bar owner who kept his celebrated recipe close to the chest. Campari is a combination of water and alcohol that’s augmented with a secret blend of fruits, medicinal plants, and bitter herbs. Experts can guess a handful of ingredients based on Campari’s flavor (such as orange peel, Cascarilla bark, ginseng, gentian, and rhubarb), but the exact measurements needed to recreate the complex liqueur are carefully guarded. Interestingly, to achieve its signature red color, the original Campari recipe included dye made from crushed beetles (don’t worry, modern-day Campari uses a non-insect additive instead).