This is a favorite drink of mine. I don’t like it strong so I go light on the rum. Add as much as you like.
First I make a simple syrup by bringing the water and sugar to a boil until the sugar is dissolved and then taking it off the heat and letting it cool.
Crush the mint in your hands and add to a gallon pitcher. Add the club soda, simple syrup (water/sugar), lime juice and rum and mix.
Server over ice or add ice to the pitcher being careful to not water down the mojito.