Add the vodka, lemon juice, lime juice, simple syrup, bitters and egg white to a cocktail shaker. Don't add in ice cubes yet! Shake for 15 seconds.
Add in the ice, and shake again for 30 seconds.
Strain the drink into a cocktail glass. The foam should collect at the top. Serve with ice, and garnish with a lemon wedge and maraschino cherry. Enjoy!
Notes
If measuring in tablespoons is easier than ounces, 1 ounce = 2 tablespoons.