In one sentence, describe what the following article is about:

To mix this drink you will need a chilled cocktail shaker, a chilled cocktail glass, a cocktail spoon, a cocktail strainer, a jigger, chilled gin, chilled vermouth, plenty of ice, and an olive.  Measure out 4 small jiggers of gin. Measure out 1 small jigger of vermouth. Place the ice in first and then add the vermouth. Swirl the vermouth around to coat the ice cubes and the shaker. Pour in the gin.  Leave the olive out, and add it once you have poured the drink into the serving glass. If you want your martini to be extra dry, pour out the excess vermouth using a strainer before adding the gin. Stir the drink for about 60 seconds so that the drink will be chilled sufficiently, diluted properly, and mixed thoroughly. Using a strainer to keep the ice in the shaker, pour the drink carefully into the serving glass. You can place the olive on a cocktail toothpick, or you can just drop it directly in the martini. Serve the drink immediately.

Summary:
Gather your tools and ingredients. Place your ingredients in the shaker. Stir the ingredients together. Strain your martini into the martini glass. Add the olive.