Leap Year Martini

Combine the 2 oz Gin, 0.5 oz Sweet Vermouth, Grand Marnier, and 0.25 oz Lemon Juice in a cocktail shaker with ice.

Shake vigorously until the outside of the shaker is very cold.

Strain the mixture into a chilled cocktail glass.

Express a lemon peel over the drink and drop it into the glass.