Place the pineapple juice, lime juice, cilantro, mint leaves, and jalapeño slices into a blender. Add the salt.
Secure the lid and blend on high for 30-45 seconds until smooth and vibrant green.
Pour the mixture through a fine-mesh strainer set over a small bottle or bowl. Use the back of a spoon to press the pulp firmly against the strainer. Chill in the fridge for at least 30 minutes before serving in shot glasses.