To create a tantalising bar drink using passionfruit pineapple vanilla syrup, start by selecting your base spirit, typically rum or vodka works well. In a shaker, combine 2 ounces of your chosen spirit with 1 ounce of the syrup. Add a squeeze of fresh lime juice for a zesty kick. Fill the shaker with ice, then shake vigorously for about 10 seconds. Strain the vibrant mixture into a chilled cocktail glass, garnish with a pineapple slice or a twist of lime, and serve. The syrup's exotic blend of passionfruit and pineapple will provide a delightful tropical sweetness, while the subtle hint of vanilla rounds out the flavours for a perfectly balanced and refreshing cocktail. Enjoy!