Use a sharp knife and cutting board to cut fresh watermelon into roughly 1-inch chunks. Measure out four cups of the chunks and transfer them into a blender.
Add a pinch of salt to the blender to enhance the juice's flavor. Secure the lid tightly.
Blend the watermelon on high speed for 30-45 seconds until the mixture is smooth and slightly frothy, with no large chunks remaining. You should see a vibrant pink liquid with a pulpy texture.
Place a fine mesh strainer or sieve over a large bowl. Pour the blended watermelon through the strainer, using a spatula or back of a spoon to press and extract as much juice as possible. Discard the pulp or save for other uses.
Transfer the strained watermelon juice into glasses. Serve immediately over ice for a chilled, refreshing beverage with a slightly pulpy appearance and a fragrant watermelon aroma.
