Fill a cocktail shaker with ice, then pour in the vodka, pineapple juice, and Chambord.
Shake well for 10-15 seconds, until shaker is quite cold.
Strain the mixture into a martini glass.
Garnish with a lemon twist or some fresh raspberries (or both!).
Notes
To make a lemon twist, cut through a lemon to make a round lemon slice. Then use a sharp paring knife to cut away most of the pith and the fruit in the middle so that you have a circle of peel. Make a cut in it so that you have a piece of peel that you can wrap around a round chopstick or something similar. If you can let it sit like that for a few minutes, it will hold its shape better. Try chilling your martini glass before making your cocktail—it will keep your drink cold for longer. You can just put the glass in your freezer for a few minutes. You can also try using a coupe glass instead of a martini glass.