Place the watermelon cubes into the blender jar, ensuring not to overfill. Secure the lid tightly.
4 cups watermelon, cubed
Blend the watermelon on high speed until smooth and frothy, about 30 seconds. The mixture should be evenly blended without chunks.
4 cups watermelon, cubed
Strain the blended watermelon through a fine mesh strainer into a large jug or bowl, pressing gently with a spatula to extract as much liquid as possible. Discard the pulp.
4 cups watermelon, cubed
Add the fresh lemon juice and honey (or sugar) to the strained watermelon juice. Stir well until the sweetener dissolves completely and the mixture is uniform.
1/2 cup fresh lemon juice, 1/4 cup honey or sugar
Transfer the mixture to a pitcher and chill in the refrigerator for at least 30 minutes. To serve, pour over glasses filled with ice cubes if desired and garnish with lemon slices or mint leaves for presentation.
Serve the watermelon lemonade cold, enjoying the vibrant color and refreshing flavor that captures the essence of summer.