DIY Orange Soda

"[Photograph: Marcia Simmons] DIY orange soda delivers the same satisfying combination of sweet and tart you get from the commercial version, but mixed in with the familiar sharpness and prickly joy of orange soda is a new and exciting flavor I wasn't used to tasting in my soda—real oranges. This recipe suggests 1 part orange soda syrup to 3 parts seltzer, for a sweetness comparable to a commercial orange soda. You can adjust the amount of seltzer to taste. Mix syrup and seltzer on a glass-by-glass basis rather than mixing a large batch and storing it. Notes: Citric acid powder, also known as sour salt, is easy to find at many markets, but you can order it online from Amazon, too. Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!..."