Chill the Glass
Place your highball glass in the freezer for 5–10 minutes before preparing the drink. A cold glass helps maintain carbonation and keeps the cocktail extra refreshing.Add Ice
Fill the glass completely with large ice cubes. Large cubes melt slower than small cubes and prevent the drink from becoming watery too quickly.Pour the Whiskey
Measure and pour 2 ounces of whiskey directly over the ice. Japanese whisky creates a smooth and delicate flavor, while bourbon adds sweetness and richness.Add Chilled Soda Water
Slowly pour 4–6 ounces of chilled club soda or sparkling water into the glass. Pouring gently helps preserve the bubbles and keeps the drink fizzy longer.Stir Gently
Using a bar spoon, stir once or twice very lightly. Avoid over-stirring because it reduces carbonation.Garnish and Serve
Add a lemon twist or lemon slice for fresh citrus aroma and serve immediately while cold and bubbly.