Rinse the fresh rhubarb stalks thoroughly under cold water to remove any dirt. Trim off the ends and slice the stalks into small, uniform pieces, about one inch long.

In a medium saucepan, combine the chopped rhubarb pieces, water, sugar, and quick-cook tapioca. Stir the mixture well to ensure all ingredients are evenly distributed.

Place the saucepan over low to medium heat on the stove, allowing the mixture to slowly come to a gentle simmer. Stir occasionally, observing as the rhubarb softens and begins to break down, which should take about 15-20 minutes.

After about 20 minutes, check the consistency of your rhubarb sauce. If it seems too thin, cook for an additional 5 minutes. Once you've achieved your desired thickness, remove the sauce from heat and let it cool slightly.

Transfer your delicious Easy Rhubarb Sauce into an airtight container. Allow it to cool completely before sealing. You can refrigerate it for up to one week, or freeze portions for up to six months.