The great thing with this mocktail is that you can absolutely make a batch of it in advance and drink it throughout the night. It will keep for up to a day in the fridge. A few tips on this:
• Combine and mix only the syrup, lime juice, apple juice and vanilla essence but not the passionfruit seeds, so the seeds don't sink to the bottom of your jug.
• Don't use ice to mix the drink or leave it in a jug with ice, which will dilute the flavours. You can keep it in the fridge so it's cold when you serve, but I also recommend shaking it with ice when you are ready to drink it.
• Rather than simply pouring the drink each time, shake it as you would when making it from fresh to really bring all the flavours together. Add a few cubes of ice and the passionfruit seeds when you come to shake and strain before serving.
• Keep a bowl of passion fruits, uncut, on hand and slice for each drink, to keep them super fresh.