Fill a cocktail shaker with ice and then add the St-Germain, vodka and orange juice. Shake for at least 30 seconds, until well chilled. To create a layered drink, pour the strawberry syrup into a martini glass and then very slowly pour the chilled mixture over the back of an inverted spoon into the glass. (Here is a how to link with pictures
, if you need a visual for this.) If you don't care about the layers, simply add the syrup to the shaker at the start. Float a few strawberry slices on top of the drink just before serving. Enjoy!