Measure out the tequila, lime juice, triple sec, and simple syrup, then pour them into the blender.
Add the crushed ice to the blender, filling it to about the halfway point for a thick, slushy texture.
Secure the lid tightly and pulse a few times to start breaking down the ice, listening for the crunching sound.
Blend on high for about 30 seconds until the mixture is smooth and frosty, with a slightly gritty to silky texture as it melts.
Stop the blender and check the consistency; if it’s too thick, add a splash of lime juice or tequila and pulse briefly to combine.
Pour the vibrant green slush into chilled glasses, allowing the frosty droplets to drip down the sides.
Garnish with lime wedges or salt rims if desired, then serve immediately with a straw for that satisfying icy crunch.
