Originally marsh mallow roots were boiled to make a "mallow water," which was then made into the candy. Marsh mallows are hard to find, having a limited range, but common mallows are much more readily available. Boil the "cheeses" (the fruits or seedpods of the plant) in enough water to cover for 20 minutes. Strain off the cheeses, which can be eaten as a vegetable. Add sugar to the mallow water. Cook the syrup down until it is very thick, beat it, and drop it in spoonfuls onto waxed paper. When cool, roll the marshmallows in confectioners sugar.