Prepare your shaker: Fill a cocktail shaker with ice cubes to chill the mixture.

Add the ingredients: Pour in the whiskey, limoncello, fresh lemon juice, and simple syrup.

Shake it up: Secure the lid on the shaker and shake vigorously for about 15 seconds. You want it well-mixed and chilled.

Strain into a glass: Use a strainer to pour the mixture into an ice-filled rocks glass. If you prefer, you can serve it straight up in a coupe glass.

Garnish: Add a lemon wheel or twist to the rim of the glass for a beautiful presentation. If you like a little fizz, top it off with a splash of soda water.

Enjoy: Sip and savor the refreshing taste of your Limoncello Whiskey Sour!