If you plan to have salt on the rim of your glass, prepare glass first. Simply run a lime wedge over the rim of a glass (we just do this on one side of the glass) and roll the rim in course salt. If you want it extra spicy, add a little tajin to your salt for flavor and heat.
Muddle 2 slices of jalapeño in cocktail shaker. Add the rest of the cocktail ingredients to the shaker and shake vigorously while you count to 15.
Add a large chunk of ice to glass, and strain cocktail over the ice. Add the slice of orange and jalapeño.