Put a martini glass in the freezer for 15 minutes to chill. Add 25ml of Cranberry to your cocktail shaker. Squeeze the juice from a fresh lime and add 20ml to the shaker. Add the remaining ingredients: 35ml Muff Vodka, 15ml Cointreau and 10ml Sugar Syrup. Add ice and shake vigorously for 10-15 seconds until your drink is nice and chilled. Strain your cocktail into your martini glass. Garnish with orange zest.