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Chill a cocktail coupe by placing it in the freezer or filling it with ice water to cool.

Combine the whiskey, dry vermouth, limoncello, freshly squeezed lime juice, and 2 dashes of orange bitters in a cocktail shaker.

Add ice to the shaker and secure the lid tightly.

Shake vigorously until the mixture is well-chilled and properly blended.

Strain the cocktail into the prepared frozen coupe glass, ensuring a smooth pour.

Serve immediately and enjoy.