Juice the limes into a 2L pitcher.
Add the mint and muddle/squish really well to release the flavors of the mint.
Add 1 cup of rum and ¾ cup of simple syrup or more to taste.
Fill the pitcher with ice, top with club soda, & stir.
SIMPLE SYRUP: Bring 1 cup of sugar and 1 cup of water to a boil. Stir until sugar has dissolved. Cool and store in the fridge.
