For three:
4 ounces silver tequila (100% agave)
2 ounces Cointreau
2 ounces lime juice
one lime
Line edges of three glasses with lime, dip in salt.
Combine tequila, cointreau, and lime juice. Shake thoroughly with ice, and decant equally into martini glasses. Add one ice cube and one lime wedge into each glass. Salud!