The Gibson Martini, just like a normal Martini, is a mix of dy vermouth and gin. Instead of the using an olive to garnish the Gibson is served with an onion. 

Ingredients:

• 2.5oz Dry Gin
• 1oz Dry Vermouth
• Pickled Silverskin Onion(s)

Preparation: 

1. Add Gin and Vermouth to a cocktail shaker
2. Add ice
3. Shake well
4. Pour, using a strainer, into your preferred cocktail glass.
5. Garnish, with a cocktail stick if available, 1-3 onions is the norm but some put more in subject to their taste.

The result will be a lovely savoury cocktail.