Prep Glass: Fill a Martini or Coupe glass with ice. Give it a quick stir and set it aside.
Add Egg White: Crack open 1 egg, separate the white from the yolk, and pour the white into the shaker. Discard the yolk.
Add Sugar Syrup: Pour ¼ oz rich sugar syrup into the shaker.
Add Lime Juice: Add ½ oz fresh lime juice.
Add Coffee Liqueur: Measure and pour ¾ oz coffee liqueur into the shaker as well.
Add Tequila: Finally, add 1½ oz Reposado Tequila to the mix.
Dry Shake: Close the shaker and shake, without ice, for 20-25 seconds.
Shake: Open the shaker. Fill it with ice cubes, close it well and shake vigorously for about 15 seconds.
Strain: Take the Coupe or Martini glass and discard the ice inside. Then, using both the cocktail strainer and the fine strainer, strain the shaken drink into the chilled glass.
Garnish: Garnish with a lime zest or slice and serve immediately.