Measure out the sugar (Demerara or brown sugar) and dissolve in approx half a cup (100ml) of boiling water. You want to make a concentrated syrup with as little water as possible.
Stir the sugar and water until the sugar is completely dissolved.
Grind the coffee and make 2 espressos. You can use instant coffee if you need to (2-3 tablespoons). Pour the espressos into the sugar syrup and stir.
Stir the coffee and the sugar syrup together until it is well mixed.
Add a teaspoon of vanilla extract and stir. For different flavors, add caramel syrup, or to make a Mocha Frappuccino add 3-4 tablespoons of chocolate syrup.
Pour the coffee/sugar mixture into an empty plastic milk container. Add the milk, replace the lid, and shake carefully to gently mix the ingredients.
If you want to use a blender, now is the time. Just make sure you use a good amount of ice (1.5 cups) because that is what will make it 'thick' like the Starbucks one and blend until just perfect!
Place the milk container in the freezer for 90 minutes, or until the drink contains some ice elements.
Pour out and enjoy! Tastes just like Starbucks, loads cheaper and you can add your own syrup flavours as well!