Boil half a cup of chopped ginger (no need to peel it) with three-quarters cup of raw sugar and a slice of lemon peel in a cup of water for twenty minutes. Strain, cool, and add the juice of half a lemon. Take a cold two-liter bottle of seltzer and pour a little out, then pour the ginger-sugar-water in.
This recipe gives a nice homemade flavor to the many cocktails that call for ginger ale. There’s rye and ginger; Mamie Taylor (scotch, half a lime); Mamie’s Sister (gin, a whole lime); Susie Taylor (light rum, half a lime); and about a hundred other variations (for an excellent list, go to CocktailDB and put “ginger ale” in the “included ingredient” blank).