Juice of 1 lime
3/4 tsp sugar (or sugar substitute)
1/2 oz orange-flavored liqueur (such as Grand Marnier)
1/2 oz triple sec
2 oz gold tequila
High-quality lager-style beer
To Make:  Combine the lime juice, sugar, orange liqueur, triple sec, tequila, and a big handful of ice in a cocktail shaker (or blender).  Shake the margarita for a good 20 seconds, then add a splash of beer.  Strain into a salt-rimmed glass filled with ice and garnish with a wedge of lime.  Serve.
» Nutrition facts for drink shown (made with sugar substitute): 250 calories, 18 g carbs, 0 g fat
» A study published in the Quarterly Review of Biology found that limes kill 25% of the bacteria in most food. In addition, these little green gems contain limonin, a substance that has been shown to help fight diseases, including lung and colon cancer.
» A splash of beer adds saltiness and a touch of effervescence to your drink. And it's good for you: An Oregon State University study found that the hops in beer contain substances called prenylated flavonoids, a potent form of antioxidant that has been shown to help prevent high cholesterol, heart disease, cancer, and-oh, yeah-Alzheimer's disease.
» To salt the glass, rub the outside rim with a wedge of lime and lightly press the glass into a plate of kosher salt. Fun fact: Bartenders first started salting margarita glasses to hide the flavor of low-quality, inferior tequila.
» The addition of Grand Marnier to the traditional margarita recipe (tequila, triple sec, and lime) mellows the tartness of the lime juice and the harshness of the alcohol, making for a smoother, more balanced drink.