Originally Posted by SAT Lawyer

Use fresh-squeezed lime juice (limes are cheap and readily available, you know?) plus a good tequila plus a good orange liqueur. For the former, I highly recommend Jose Cuervo Platino (which is a standout tequila, even though the rest of the Jose Cuervo line is not). For the latter, Cointreau, or the less expensive, but still good alternatives of O3 Premium Orange Liqueur or Patrón Citrónge will work well.