Meanwhile, make the Pimm’s syrup. Put the Pimm’s and sugar in a small pan, heat gently, stirring to dissolve, then bring to the boil and bubble for 4-5min or until the mixture is syrupy. Remove from the heat. Whisk in the strawberry jam. Add the strips of zest, mint leaves and cucumber and swirl the pan. Leave to infuse and cool completely (at least 1hr), then strain into a small jug, cover and leave at room temperature.