Step 1

1 Combine half the watermelon, lime juice, ginger, sugar, salt and basil leaves in a high-powered blender; blend on high speed for 30 seconds, or until smooth

Step 2

2 Pour through a fine-mesh strainer set over a large bowl and use a flexible spatula to push the mixture through

Step 3

3 Discard the solids

Step 4

4 Repeat with the remaining fruit, juice, ginger, sugar, salt and basil

Step 5

5 Transfer the strained juice to a pitcher

Step 6

6 Add the water and stir to blend well

Step 7

7 Refrigerate until well chilled

Step 8

8 To serve, pour into ice-filled glasses and garnish with basil