Barefoot Contessa's Real Margaritas

As Sara will attest, these are fantastic. A perfect summer afternoon drink. Will make your mouth pucker with all the juice. I recommend using an electric juicer if you have it, or at least a handheld squeezer. Otherwise, a good arm workout.

1 lime, halved
Kosher salt
1/2 cup freshly squeezed lime juice (5 limes)
2 tablespoons freshly squeezed lemon juice (1 lemon)
1 cup Triple Sec
3 cups ice
1 cup white tequila
Directions
If you like margaritas served in a glass with salt, rub the outside rims of six glasses with a cut lime and dip each glass lightly into a plate of kosher salt.
Combine the lime juice, lemon juice, Triple Sec, and ice in a blender and puree until completely blended. Add the tequila and puree for 2 seconds more. Serve over ice.
If you prefer frozen margaritas, halve each of the ingredients, double the ice, and blend in two batches. Serve with a cut lime.