2 oz of white rum (or Light Rum)
1 oz of sugar syrup (or simple syrup)
1 of fresh lime (or lime)
Wash a lime, remove top and bottom, and thinly slice into half rings. Add lime pieces to glass and crush with the flat end of a barspoon. Add rum and sugar syrup, top with broken ice, and muddle together. Add a short straw, and serve.
Garnish with the lime disc in the drink is garnish enough but also consider expressing a lime zest twist over the drink and then discarding .