Wild Cherry Cough Syrup

1 teaspoon wild cherry bark
1 1/2 to 2 1/2 teaspoons chopped dried marshmallow root
2 cups water
2 cups granulated sugar
1/2 scant teaspoon cream of tartar

Make a decoction of the cherry bark and marshmallow root by boiling in water for about 4 minutes. Steep the mixture with the cover on the pot for a few minutes. Slowly stir in the sugar and cream of tartar. Simmer until the mixture becomes thick and sugar granules completely dissolve. Transfer to a container and allow to cool before covering tightly.