Prepare your glass: You can chill your glass in the freezer before you prepare your drink.
Combine the ingredients: Combine ice cubes, the vermouth, and gin into a shaker and shake vigorously for 10 seconds.
Fill 1 glass: If you prefer ice shards floating at the top of the Martini, simply strain the drink into your Martini glass. If you don’t want any, then strain it through a fine-mesh strainer to catch the ice shards.
Serve: Garnish with 3 green olives on a cocktail pick for decoration.