As well as the traditional version, the Soho restaurant also serves a Passion Sour made with passion fruit purée and a Pisco Punch using pineapple syrup (0207 292 2040).
La Bodega Negra
Although not actually a Peruvian restaurant, the Soho Mexican joint serves a traditional pisco sour (020 7758 4100).
Peru and Chile both claim to have invented pisco, so this undercover Shoreditch cocktail bar provides a compromise with their Sangre Chilean - a mix of Chilean pisco and Peruvian bitters (0207 253 4101).
If you manage to get a reservation at Dabbous, make sure to try a Grapes of Wrath. The martini cocktail is made from pisco, damson syrup, plum bitters, cranberry juice and lemon (020 7323 1544).
The cocktail list at the new Japanese/Brazilian/Peruvian restaurant hasn't yet been finalised, but we are told that the bartender would be more than happy to mix us a pisco sour (020 3640 7330).