Lyaness, the South Bank hotel bar metres from the Thames, is industry maverick Ryan Chetiyawardana’s flagship venue. A lot has changed since it was Dandelyan displayed on the glass front edifice, except for the inquisitive nature of the drinks. At Lyaness, a light blue interior and green marble bar, things can be as simple or complex as you want them to be. The drinks are predicated on protagonist ingredients: Purple Pineapple, Ultra Raspberry, Infinite Banana, Peach Emoji, may sound straightforward, but a whole lot of R&D has gone into extracting the weird from the otherwise ordinary. Then there is Vegan Honey (an in-house reverse process in lieu of the bees); Tea-mooth where tea meets vermouth, while Golden Levain is an exploration of yeast, using a sour dough starter. If that all sounds like a lot to get your head around, you can opt in or out of the geekery. Fancy an Old Fashioned? Enter the Soy Wax Old Fashioned, with scotch, Infinite Banana, organic candlewax and burnt banana bitters. Maybe just a Dry Martini? Try the Cereal Martini: vodka, Golden Levain and seeded vermouth. Clever, yes, but delicious too.