Pulpy Salty Citrus Soda

Calamansi is our native citrus, the offspring of the ancient elopement of a mandarin and a kumquat, out in the wild, without human intervention. It starts off green and blushes into orange when ripe, the fragrant peel matching its orange flesh. It looks like an orange in miniature—like a Brussels sprout next to a cabbage—but stings like a lime, with only the faintest, tempering sweetness. We squeeze it into almost everything, for a bright flash, sunny and sour.

Ideally for this reci