Aunt Chilada's El Diablo Margarita

Source: Aunt Chilada's - Phoenix, Arizona

1 3/4 ounces tequila
3/4 ounce Cointreau
10 ounces margarita mix
1/2 ounce Grand Marnier
1 lime wedge
Kosher salt

Trace a wedge of lime around the rim of a margarita glass and dip the glass in a plate of salt. Fill the glass with ice and add liquid ingredients in the order listed, topping with the Grand Marnier. Garnish with the lime wedge and a straw.