The John Tom Collins is still a Collins cocktail a long drink stirred with ice and topped with soda using London dry gin believed to have originated mid-19th century with a headwaiter of that name who worked at Limmer's Old House in central London.
John Tom Collins
2 oz Old Tom Gin or London Dry gin
1 oz lemon juice, freshly squeezed
1/2 oz simple syrup
3 oz Club soda
lemon or orange wheel or maraschino cherry for garnish
Combine the gin, lemon juice, and simple syrup in a Collins glass.
Fill with ice, top with club soda and stir. Garnish with a lemon or orange wheel or maraschino cherry.