Cut a fiery red diablo lime into eighths (or use a regular Mexican green lime if that is all that is available). In a bowl, muddle (crush) the lime with 2 tablespoons of sugar using a wooden "muddler" stick or a pestle, until all of the juice is extracted from the lime segments and the sugar has dissolved into the juice. (remove any seeds). Add 1/4 cup (2 oz or 2 jiggers) of cachaça and stir to mix. As an optional step, you can stir with your impecably clean finger and taste, adjusting with more lime or sugar as necessary. Then pour over ice in an Old Fashioned glass, including the lime segments. No garnish necessary, but a sprig of fresh mint is always nice. Sip and enjoy.