Texas Monthly magazine published the batched-version of the prickly pear margarita served at the super cool Starlight Theater Restaurant & Saloon in Terlingua as Starlight Theater's Prickly Pear'ita. We adapted it for one. Look for prickly pear syrup or nectar that has real sugar. Avoid the cheap stuff with corn syrup.
Mix together the tequila, prickly pear syrup, simple syrup and lime juice in a cocktail shaker.
Shake vigorously and strain into a collins glass filled with ice cubes.
Some folks rub the rim of each glass with a cut lime wedge and dip the rim into salt to coat it thoroughly.
NOTE: I like this recipe over other prickly pear margarita recipes because it does not include the traditional orange liqueur. Savor the flavor of cactus!
If you like margaritas, Lucinda Hudson's outstanding book on the subject of tequila, Viva Tequila!: Cocktails, Cooking, and Other Agave Adventures, is a must for your library.