Prepare the honey simple syrup by combining 1 tablespoon honey with 1 tablespoon warm water; stir to fully incorporate and let cool.
In a pitcher or cocktail shaker, add tequila, grapefruit juice, lime juice and honey simple syrup; stir to combine.
Run the lime wedge around the rim glass and dip into black cone salt. Fill the glass to the top with ice. Pour half of the tequila mixture over the ice. Top with seltzer and serve.
