Start by making the strawberry lemonade. Place the strawberry puree, lemon juice, sugar and rosemary in a saucepan.
Bring up to the boil, stirring until the sugar has dissolved. Skim off any scum that rises to the surface.
Simmer on medium high for about 10 minutes until slightly reduced and syrupy.
Remove the rosemary sprigs and strain to remove the strawberry seeds.
Pour into a sterilised bottle and seal.
For the cocktails, combine the Limoncello, rum and lime juice.
Pour into a chilled glass and top with club soda and swizzle gently to combine.
Add fresh lemon slices and mint leaves.
Rest the rosemary stems on the rim of the glass and light just before serving. Salute!