Cut 4-6 stems of rhubarb into small pieces, about 1 inch.
Combine the rhubarb, 1/2 of organic cane sugar, and 3 cups of filtered water to a pot.
Bring it to a boil and simmer covered at a soft boil for about 10 minutes.
Remove pot from the heat and let it return to room temperature.
Pour the mixture through a fine mesh strainer (or cheesecloth!) to strain all of the rhubarb chunks out of the liquid. Mash the rhubarb some to release all the liquid. You can reserve the cooked rhubarb to use in smoothies, pie, or stew.
Store the beautiful pink juice in a a glass container and let it chill in the fridge.
Combine 1 part rhubarb concentrate with 2 parts unflavored sparkling mineral water. You can also use flat water if you don't have sparkling.