This is my version of the Paloma after testing various grapefruit sodas. I've found that the best grapefruit sodas are Jarritos and San Pellegrino. And mixing them together is fantastic.
2 oz Espolon Reposado
1 oz ruby red grapefruit juice
1 pinch kosher salt
1/2 oz fresh lime juice
1/4 oz light agave nectar
2 oz Jarritos grapefruit soda
2 oz San Pellegrino grapefruit soda
Lime wheel and grapefruit peel garnish
Add all ingredients except grapefruit soda directly into Collins glass. Add ice into glass. Stir with a barspoon until well chilled. Top with the grapefruit soda and stir lightly to incorporate. Garnish with lime wheel and grapefruit peel.