Herbalists treat nausea with ginger tea, which is easy to make. Steve Kippax, a western and Chinese herbalist at Third Space Medicine in Soho, advises: "Peel a two-inch piece of fresh root ginger, chop it up and simmer in a mug-and-a-half of water. Reduce to three-quarters of a mug, strain, sweeten with honey and drink." According to Kippax, ginger beer will do at a pinch.