Take several mint leaves, give them a clap to wake them up and add them to the Mason jar.
Add the 1 oz. of lime juice to the jar.
Add the 4 pieces of the juiced lime half into the jar.
Add 1 oz. of the simple syrup into the jar.
Add 2oz. of the white rum
Fill the jar with ice to the rim. Cover with lid and shake well.
Once it is cold, open the jar, add more ice and top it with soda water.
Insert straw and mix to incorporate the soda water into the drink.
Finally, take several sprigs of fresh mint, give them a tap to wake them up and add to the top of the jar for garnish.