— mint leaves
— lime juice
— white rum
— club soda
Place mint leaves in the bottom of the mason jar and bruise slightly with a spoon. Add lime juice and sugar. Mix together to dissolve sugar. Add the rum and fill the glass halfway with ice. Top with club soda and stir.
As found here: https://www.yahoo.com/news/get-the-summer-party-started-with-mason-jar-119998310330.html