Watermelon Ginger Cooler

• 1 cup cubed watermelon
• 2 key limes (one juiced, one sliced as garnish)
• 1/2 ounce ginger syrup
• 1 ounce white rum

1. Toss the watermelon into a blender or food processor, and blitz for a minute or two. After that you, you can run the juice through a sieve (which will ensure you have a smooth watermelon juice), or leave it a little chunky.
2. Juice one of the key limes into the watermelon juice. Give it a little stir. Slice the other, thinly and crosswise, and set it aside.
3. Empty some ice into a cocktail shaker. Pour the ginger syrup and the rum directly over the ice. Add the watermelon-key lime juice. Attach the cap, and give the cocktail a brisk shake, until the metal feels quite cold to the touch.
4. Pour the drink out into a glass, making sure to leave the ice behind. Garnish with the remaining key lime, and enjoy cold.

cubed watermelon, ginger syrup, white rum

Taken from food52.com/recipes/18014-watermelon-ginger-cooler (may not work)