Add all the ingredients into a blender and whizz.
Serve in a tall glass.
Picture: Mary Contini
• Mary Contini is a director of Valvona & Crolla, 19 Elm Row, Edinburgh. Her latest book, Dear Alfonso, A Feast of Love and Laughter will be previewed at the Edinburgh International Book Festival on 26 August, 7:15pm, £12, www.edbookfest.co.uk
