Lager is the secret ingredient in this margarita.
To salt the margarita glasses, rub the outside rims of 4 big glasses with a cut lime and press them lightly into a plate of kosher salt, to coat.
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 really well, for a good 20 seconds, add a splash of beer and strain into the salt rimmed glasses filled with ice. Garnish with a lime wheel.