Take a cocktail shaker and place some crashed ice in it.
Gently pour 2 ounces of London dry gin, 1/2 ounce of Cointreau, 1/2 ounce of freshly squeezed lemon juice.
Now crack one egg into it.
Seal the cocktail shaker properly and shake it vigorously for few seconds until all ingredient mix well.
Take a chilled cocktail glass and pour the cocktail into it.
Grab a fresh lemon, cut it into fine slice. Cut one of the slices from the tip and place it on the side of your glass.
Your White Lady Cocktail is all set, serve immediately. Enjoy!