This is a great party punch you can make in bulk. I would blend the watermelon and herbs
into juice, blend some lemons, and strain the juice. Taste as you go, and add them into your pitcher until you have a tart watermelon lemon mixture. Add simple until it is just a tad bit too sweet and then add Whiskey to balance. The key here is to taste as you go.

Hibiscus Watermelon Whiskey Smash

INGREDIENTS (1 SERVING)

• Three medium-sized cubes of watermelon
• Three lemon wedges
• 1 oz Hibiscus simple syrup
• 2 oz whiskey, I used Uncle Nearest Premium Whiskey
• 10 herb leaves ( you can use basil or mint)

To make this at home put the lemon wedges and watermelon cubes into your jigger and muddle to release the juice of the watermelon and the juice and oils from the lemon wedges. Add the Whiskey, herbs, simple syrup, and fill with ice. Shake until you feel the jigger is very cold. Strain the contents over crushed ice and garnish.

https://www.brownbelle.com/home/2020/6/14/hibiscus-watermelon-whiskey-smash