Prepare the watermelon by removing seeds and cutting into chunks. Measure 3 cups of watermelon chunks using a measuring cup.
Add the watermelon chunks, tequila, lime juice, and a pinch of salt into the blender. Secure the lid tightly.
3 cups watermelon chunks
Blend on high speed until the mixture is smooth, thick, and frothy with no visible chunks. This should take about 30-45 seconds.
Pour the blended mixture into chilled glasses. Optional: rim the glasses with salt by rubbing lime juice around the edge and dipping into salt.
3 cups watermelon chunks
Serve immediately with a straw or a garnish of lime wedge. The drink should be icy, vibrant pink, and frosty in appearance.