Once you know Tom Collins, you can master all The Collins. 

The Collins

A popular example of this catgory is the Tom Collins. The name has its origins in John Collins, head bartender at Limmer's Hotel in London. His signature drink contained genever, lemon juice, sugar and soda and was a popular drink in the 1830s. 

The Drink made it to New York in 1850, when a British officer taught it to the bartenders of The Clarendon Hotel. It was soon changed into a Tom Collins and turned up in the new edition of Jerry Thomas' cocktail book. 

The Collins is a sour topped with soda and served over ice in a long drink glass.

The Classic

Elderflower Collins

1 Part Absolut Vodka
3/4 Part Fresh Lemon Juice
1/4 Part Elderflower Cordial
3 Parts Soda Water

How to mix: Pour all ingredients into a highball glass filled with ice cubes and garnish with two lemon wheels. 

The Contemporary Twist

Ruby Collins

1 Part Absolut Ruby Red
1/2 Part Fresh Lemon Juice
1/2 Part Simple Syrup
3 Parts Soda Water

How to mix: Pour all the ingredients into a highball glass filled with ice cubes and garnish with a pink grapefruit wedge.