Start by cutting your ripe seedless watermelon into small cubes, measuring about 6 cups. Place these cubes into a blender and blend until smooth, about 1-2 minutes. Strain the mixture through a fine mesh strainer to remove any pulp, yielding about 4 cups of pure watermelon juice.

In a large pitcher, pour in 4 cups of cold water and add 3/4 cup of freshly strained lemon juice. Use a whisk to mix until all the sugar dissolves completely.

Gradually stir in the pureed watermelon juice into the pitcher. Stir gently for about 1 minute to meld all the flavors.

Taste your Watermelon Lemonade and adjust the sweetness with more sugar if desired, ensuring all the sugar dissolves.

Grab some ice cubes and place them in glasses or the pitcher. Garnish with fresh mint and serve immediately.