Skinny Spicy Blackberry Basil Margs (Alcohol-Free)

1. Mix together the zest of one lime and two tablespoons of salt. Set aside. 
2. Slice a jalapeño. 
3. Add half the sliced jalapeño, a big handful of blackberries, the juice of two limes, 5 leaves of fresh basil, lots of ice, and a bit of water to a cocktail shaker. 
4. Shake aggressively to break up the berries and combine all ingredients. 
5. To prepare your glass, rim it in lime juice and then dip it into the lime zest and salt mixture. 
6. Fill the prepared glass halfway with ice. 
7. Strain about half of the shaken mixture into the glass. 
8. Fill the rest of the glass up with Topo Chico sparkling water. 
9. Garnish with additional basil leaves and jalapeño slices before serving.