Fill a glass with ice, about an 8-10 oz glass. Set aside.
Put a few cubes of ice in a cocktail shaker (in a pinch use a mason jar carefully!!). Pour in the Tequila, Lime Juice and Crème de Cassis. Give it a vigorous shake for 20 seconds.
Strain into the prepared glass. Top with 2-3 oz ginger beer.
Garnish with a lime wedge.
Notes
GINGER BEER: not all ginger beers are created equally!! Some are SO overly sweet. The Q Mixer and Fever Tree are two brands that have a nice balance of sweetness, spiciness and bubbles.TEQUILA: a mid range tequila will work perfectly fine for this drink; Esplon, Cazadores or Jose Cuervo are great options here.