Combine 2 cups (500 mL) water with 2 cups (500 mL) of the grape juice, sugar and food colouring in a large saucepan. Bring to a boil before slowly whisking in the tapioca, cooking for one minute. Remove from the heat and let cool to room temperature, stirring often.
Step 2
Meanwhile, stir the remaining grape juice and lemonade concentrate together in a large pitcher, cover and keep chilled. Once cooled, add the tapioca mixture to the pitcher, stirring to separate the tapioca. Cover and refrigerate until ready to serve.
Step 3
Just before serving, stir up tapioca mixture while adding the sparkling water. Garnish with ice, slices of lime and serve with a thick straw.
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