Ahh fresh lime juice. Added to salsa, guacamole, and in a quick spicy tortilla soup that I made for our Mexican movie night dinner. We enjoyed this along with chicken flautas and of course, margaritas.
I like the classic straight up version from sauceguide.
1) Prep your vessel of choice by giving the rim a once over with a piece of lime and a light dose of salt.
2) Shake the following with ice:
2 shots tequila (I like el Jimador for mixing, straight is another matter entirely)
1 shot triple sec (or Cointreau in a pinch)
1 shot fresh squeezed lime juice
3) Strain into prepared margarita, coupette, or martini glass.
I sometimes add a bit of Rose's lime cordial and a splash of gomme syrup to sweeten it a bit for some friends, blended with fresh (strained) strawberries for a barbecue accompaniment, and my former flatmate's favourite: blended with a cup or so fresh watermelon.