Can be prepared in 45 minutes or less but requires additional unattended time.

Ingredients

　　2 1/2 cups boiling water

　　1/4 cup firmly packed light brown sugar

　　2 tablespoons minced crystallized ginger

　　1 tablespoon tamarind paste (the soft pliable variety, available at Thai, East Indian, and other Asian markets), or to taste

　　1 tablespoon fresh lemon juice, or to taste

　　Thin lemon slices for garnish

　　In a bowl whisk together the boiling water, the brown sugar, the ginger, and the tamarind paste until the mixture is combined well, let the mixture cool, and strain it through a fine sieve set over a pitcher. Stir in the lemon juice and chill the mixture for at least 1 hour, or until it is very cold. Divide the cooler among tall glasses filled with ice cubes and garnish each drink with a lemon slice.