Originally this early 19th century cocktail was known as John Collins. Later it was renamed Tom Collins as it was commonly made with the 'Old Tom' brand of Gin.

(Makes: 1 Serving)

25ml of Gin
25ml of freshly squeezed lemon juice (half a large lemon)
1 teaspoon of white castor / superfine sugar
50ml soda water
crushed ice
lemon
2 straws

Half fill a highball glass with crushed ice. Pour in the gin and lemon juice, add a teaspoon of sugar and stir until dissolved. Fill the glass with soda water, a slice of lemon and garnish with two straws.