Add 60ml bourbon, 30ml fresh lemon juice, and 15ml simple syrup to a cocktail shaker.
Fill the shaker with ice cubes.
Shake vigorously for 10–12 seconds until well chilled.
Strain into a chilled whiskey sour glass over fresh ice.
Garnish with an orange slice and a maraschino cherry.
For a silkier, more elevated texture, dry shake the ingredients without ice first, then add ice and shake again - the result is a naturally frothy, velvety sour without the need for egg white.
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