This Tom Collins cocktail has been popular for a long time, but the origin of the name is still up for debate. Some think it was named after a sweet gin called Old Tom, and others believe the drink was named after the bartender who invented it. —Taste of Home Test Kitchen
Optional garnish: Orange slice and maraschino cherry
Fill a shaker three-fourths full with ice. Place remaining ice in a Collins or highball glass; set aside.
Add the gin and sour mix to shaker; cover and shake until condensation forms on outside of shaker, 10-15 seconds. Strain into prepared glass. Pour club soda into glass. If desired, garnish with orange slice and cherry.