Mexican Mule★ ★ ★ ★ ★(491 ratings) Tweet this Recipe Share on FacebookPrep: 1 minMaking: 1 minTotal: 2 mins Serving: 1 cocktail Ingredients 50ml / 1.75oz Tequila. 10ml / .3oz Grapefruit Juice. 120ml / 4.5oz Ginger Beer. 1 Slice of Lime. Recipe Fill a Copper Mug a quarter full with ice (crushed is traditional if you’ve got it). Pour in your Tequila. Add your Lime Juice. Pour in your Ginger Beer. Add a slice of lime for garnish.