Step 1: Prepare the watermelon puree. Place the cubed watermelon into a blender. Blend until completely smooth. If you prefer a pulp-free margarita, strain the puree through a fine-mesh sieve into a pitcher or bowl, pressing on the solids to extract all the liquid. Discard the pulp. This yields about 1.5 - 2 cups of watermelon juice, perfect for our watermelon margarita recipe.
Step 2: Rim your glasses (optional). If desired, run a lime wedge around the rim of two margarita glasses or tumblers. Invert the glasses onto a plate of salt (or chili-lime salt) to coat the rim evenly. Set aside. This step adds a classic touch to your watermelon margarita.
Step 3: Combine ingredients. In a cocktail shaker, combine the fresh watermelon puree (about 1 cup), Blanco tequila, fresh lime juice, and agave nectar. Add a handful of ice to the shaker. This ensures a perfectly chilled watermelon margarita.
Step 4: Shake well. Secure the lid on the shaker and shake vigorously for 15-20 seconds, until the shaker is thoroughly chilled on the outside. This properly mixes and chills all the components of your watermelon margarita recipe.
Step 5: Serve and garnish. Fill your prepared glasses with fresh ice. Strain the watermelon margarita mixture from the shaker into the ice-filled glasses. Garnish each glass with a fresh lime wedge or a small watermelon slice. Enjoy your refreshing watermelon margarita immediately! If making a larger batch of this watermelon margarita recipe, you can combine all ingredients in a pitcher and stir well over ice before serving.