Blood oranges are always just a little bit better than the regular kind (such a lush color!), and a spicy margarita is just a little bit better than a regular one. This margarita has it all.
Place one lime wedge, four sprigs of cilantro and two serrano pepper wheels in the bottom of a cocktail shaker and muddle thoroughly. Add the tequila, blood orange purée, and sour mix.
Shake ingredients with ice and strain over fresh ice in a salted-rim glass.