Step 1.
- Slice the watermelon into cubes and blend them until smooth to create watermelon juice.
Step 2.
- Strain the juice through a fine mesh sieve to remove pulp, yielding about 2 ounces of juice.
Step 3.
- In a highball glass, fill with ice cubes.
Step 4.
- Pour in 1.5 ounces of gin followed by 2 ounces of tonic water.
Step 5.
- Add 2 ounces of fresh watermelon juice and gently stir to combine.
Step 6.
- Garnish with a watermelon wedge and a sprig of mint.