2 fluid ounces whiskey
1 fluid ounce amaro liqueur (such as Averno®)
1 teaspoon lemon juice, or to taste
2 fluid ounces lemon-lime flavored soda
Fill a cocktail shaker with ice; pour in whiskey, amaro liqueur, and lemon juice. Cover shaker and shake vigorously. Strain drink into a low boy cocktail glass. Top with lemon-lime soda.