Raspberry Shrub: Combine the raspberries and the sugar in a small bowl. Mash well, cover with plastic wrap and refrigerate overnight.

Add the vinegar and stir well. Strain the mixture through a fine mesh sieve into a clean bowl, pressing on the solids. Discard the solids.

Pour the shrub into a sealable container and store in the refrigerator.

To make the cocktails: Fill a cocktail shaker with ice and add the shrub, orange liqueur and vodka. Shake well and strain into a stemmed flute or martini glass. Top with club soda and garnish with a lime wheel.

*For a refreshing non-alcoholic drink, add a splash of the raspberry shrub to club soda and serve over ice.