To make your own ginger syrup: Slice 368g (13 ounces) fresh ginger root, unpeeled, into 1/8" or 1/4" slices (a food processor makes short work of this task. You should have about 4 cups. In a large, heavy saucepan, bring the ginger, 3 1/2 cups (695g) granulated sugar, and 3 1/2 cups (794g) water to a boil. Boil the mixture for 45 to 60 minutes, until it registers 216°F to 220°F on a digital thermometer. The lower temperature will give you a thinner syrup, one that's easy to stir into drinks; the higher temperature will yield a thicker syrup, better for baking. Remove the pan from the burner and carefully strain the syrup into a non-reactive container. Store in the refrigerator indefinitely. Yield: about 2 1/4 cups syrup.