Cocktail of the week: Beach House Falmouth’s the harbour – recipe | The good mixer

A sprightly, grapefruity number in the manner of a gin sour, and with a dash of Campari to give it an extra grown-up edge

I’m a huge fan of Campari, so am always keen to come up with new cocktails in which it can take centre stage, and this zingy little number is now a firm favourite. We also love working with local Cornish producers, and Caspyn’s dry gin is made in West Penwith, on the southern tip of the county.

William Speed, co-owner, Beach House Falmouth, Cornwall