1 tablespoon sugar,
1/2 cup cachaca or 1/2 cup white rum or 1/2 cup vodka or 1/2 cup sake,
1 Cut the lime in quarters then cut them crosswise.
2 Put lime and sugar in a tall glass and mash with a pestle (or a wood spoon, rolling pin, etc).
3 Add the same amount of liquor on the lime juice and stirr.
4 Add ice and stirr again.
In Brazil, the guys that sell it at the beach put another glass upside down over it, hold both with one hand and shake.