Step 1.
- Chill a cocktail glass by filling it with ice water and set aside.
Step 2.
- In a mixing glass, combine the gin and dry vermouth with ice.
Step 3.
- Stir gently until well chilled, about 30 seconds.
Step 4.
- Discard ice water from the cocktail glass.
Step 5.
- Strain the mixture into the chilled cocktail glass.
Step 6.
- Garnish with an olive or a twist of lemon peel.