Place the mint leaves, fruit slices, simple syrup, and either lemon curd or orange marmalade (depending on which flavor you're making. SEE NOTE) in the bottom of a cocktail shaker.
Use a cocktail muddler or the end of a wooden spoon to muddle the flavors together and smash the fruit/herbs.
Pour in the vodka and add ice to the cocktail shaker. Shake well.
Pour in a glass filled with ice, about half way up the glass. Top with club soda.
Garnish with fruit slices and mint.
NOTE: You can use half lemon curd/half orange marmalade if you'd like to combine the flavors. They taste great on their own as well as together!To make non-alcoholic, simply leave out the vodka and use more club soda or lemon lime soda. Enjoy!