Vegan Recipe: Watermelon and Lemon Juice Posted by Susan Siow | Nov 24, 2012 | Beverage, Updates, Vegetarian Recipes The vegan recipe for Watermelon and Lemon Juice: servings – 3 Ingredients 3 cups seeded watermelon cubes 1 lemon (squeeze the juice) Method Place all the ingredients in a blender. Pulse until smooth. Enjoy!