In a collins glass or a rocks glass, combine tequila, crème de cassis, lime juice and grenadine over ice. Stir to combine.
Top the drink off with ginger beer as a bubbly topper.
As an optional garnish, add two small red peppers as horns and a lime wedge if you like!
Notes
You can use any type of smaller red peppers for the garnish. If you can't find them, you can also make a garnish like this for the top of the glass using red paper.
Some recipes call for a float of cassis along the top of the drink.
Some recipes call for an empty lime shell filled with cassis on top of the drink. This is a nice finishing touch!