Stir together the salt and sugar on a small plate.
Rim each glass with a grapefruit wedge and dip it in a mixture of the salty chili sugar.
Mix together sliced grapefruit, grapefruit juice, kombucha, and ginger beer in a large glass or pitcher and let chill in the fridge until ready to serve.
Pour into rimmed glasses and garnish with a sprig of fresh rosemary sprig.
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