Monin Green Apple Syrup

As recommended by Nigella Lawson in her Green Apple Martini:

1 shot vodka or gin
1 shot sour apple liqueur
1/2 shot Monin Green Apple syrup
slice of Granny Smith apple to garnish

1. In a martini glass, combine the vodka/gin over lots of ice, and add the liqueur and syrup.
2. Slice a segment of apple, removing any core. Cut a nick in the bottom of the slice horizontally, and slip it onto the edge of the glass.