Cut a few lime rounds that are 1/4" thick. Set aside.

Add the cranberries to the bottom of the glass and press them with your muddler or a spoon. This will release the flavors of the cranberries.

Add the mint leaves and press them gently with the muddler to release the oils.

Add the lime juice, then the raspberry syrup and rum.

Add some ice to the glass.

Top the glass with soda water.

Stir slowly with your spoon when stirring, don't go all way to the bottom of the glass when you stir so you don't disturb the mint leaves. This tip makes for a more pleasant drinking experience.

Add a lime wheel and mint leaf as garnish.