Pour tequila into a cup then add the sliced jalapeno. Let sit for at least 1 hour or infuse the tequila with jalapeno overnight.

Blend the prickly pear in a blender with a little water. Strain juice in a separate container to remove seeds. Set juice aside.

Fill 1/2 of pitcher with ice, add tequila, about 1/2 cup of prickly pear juice, triple sec, lime juice and stir vigorously. Taste and adjust with triple sec for a little sweetness, if needed.

To serve, rim glass tumblers with tajin chile spice and fill with the cocktail.