Rim a rocks glass with black salt by moistening the edge with a lime wedge and dipping it in black salt. Set aside.
In a shaker, combine tequila, black cherry juice, lime juice, orange liqueur, and agave syrup. Add ice and shake vigorously.
Strain into the prepared rocks glass over fresh ice.
For the “devil ears,” cut the tops off two small red peppers, remove seeds, and cut small slits to attach them to the glass rim.
Garnish with the red pepper “devil ears” and enjoy!