To make your Starbucks lemon bar Frappuccino, first, prepare your lemonade.
Pour your preferred amount of water into the saucepan, add sugar and simmer it over low heat
Squeeze your lemon in a glass as your mixture is simmering
Transfer the lemon juice and the simple sugar water syrup you just made to a pitcher
Add more cold water as you mix until you achieve your desired consistency.
Add milk, vanilla syrup, and ice to the mixture and transfer it into a blender
Carefully blend the mixture and pour it into your glass
Top up your drink with whipped cream and caramel sugar topping, and enjoy.