Rim your glass with lime and salt, set aside.
Gut the cactus pears and place into a blender or bullet. Mix until pureed. You might need to add water to break it up.
In a shaker, muddle the lime juice and jalapeño.
Add the mezcal, a couple ice cubes, and the prickly pear puree to the shaker & shake well.
Pour the drink into your glass and add the ginger beer.
Garnish the drink with a slice of jalapeño.
Optional: strain the liquid into your glass to avoid seeds and sedatives from the pears if desired. I like mine a little chunky.