Take the olives and skewer them on a toothpick or other cocktail skewer. Place into the martini glass.
Measure the vodka and gin into a cocktail shaker.
Add the olive juice. (If you aren't sure how much you like, the 1 tbsp is a good starting point, but I use 2 tbsp because I like mine dirtier).
Add a tiny bit of vermouth to the shaker. I probably add less than a tsp worth.
Add 3-4 ice cubes, and cover the shaker and shake it for about 30 seconds.
Pour into the martini glass and enjoy!