Step 1.
- Cut the watermelon into cubes and place them in a shaker.
Step 2.
- Muddle the watermelon until it is mostly juiced.
Step 3.
- Add absinthe and lime juice to the shaker.
Step 4.
- Fill the shaker with ice and shake vigorously for about 15 seconds.
Step 5.
- Strain the mixture into a highball glass filled with ice.
Step 6.
- Top with club soda and gently stir.
Step 7.
- Garnish with a watermelon slice and a sprig of mint.