Make a simple syrup by combining sugar with the warm water. Mix until sweetener is completely dissolved.
Place syrup into a pitcher and add cold water, sauerkraut brine and lemon slices. Give lemon slices a twist to release some of the lemon juice as you are putting them into the pitcher. Add ginger, if using.
Let sit for about a half hour to allow flavors to mingle.
Serve over ice for a refreshing drink, or serve at room temperature for a cozy healing beverage.
Excerpted fromFermented Vegetables by Kirsten K. Shockey and Christopher Shockey, photography by Erin Kunkel, used with permission from Storey Publishing. Photo by Erin Kunkel.