PreparationMake syrup: Cook ginger in water in a small saucepan at a low simmer, partially covered, 45 minutes. Remove from heat and let steep, covered, 20 minutes. Strain mixture through a sieve into a bowl, pressing on ginger and then discarding. Return liquid to saucepan and add sugar and a pinch of salt, then heat over medium heat, stirring, until sugar has dissolved. Chill syrup in a covered jar until cold. Assemble drinks: Mix ginger syrup with seltzer and lime juice (start with 1/4 cup syrup and 1 1/2 teaspoons lime juice per 3/4 cup seltzer, then adjust to taste). Cooks' note:Ginger syrup keeps, chilled, 1 week.
PreparationMake syrup: Cook ginger in water in a small saucepan at a low simmer, partially covered, 45 minutes. Remove from heat and let steep, covered, 20 minutes. Strain mixture through a sieve into a bowl, pressing on ginger and then discarding. Return liquid to saucepan and add sugar and a pinch of salt, then heat over medium heat, stirring, until sugar has dissolved. Chill syrup in a covered jar until cold. Assemble drinks: Mix ginger syrup with seltzer and lime juice (start with 1/4 cup syrup and 1 1/2 teaspoons lime juice per 3/4 cup seltzer, then adjust to taste). Cooks' note:Ginger syrup keeps, chilled, 1 week.