Wash the rhubarb and trim both ends. Rhubarb leaves are toxic, so be sure to discard. Slice into 1-inch slices.
Toss the rhubarb with the sugar in a large bowl. I add a squeeze of lemon juice, but that's optional.
Transfer to a dutch oven or large saucepan and bring to a boil, stirring constantly to dissolve the sugar. Let boil gently for about 5 minutes to soften the rhubarb and release the juices. Remove from the heat and add the vanilla, if using.
At this point you can fill jars, let cool, and refrigerate. The sauce is naturally on the thin side, but it does thicken slightly as it chills. Use within 2 weeks. Can be frozen for up to 3 months. Or you can water bath can your rhubarb sauce, see instructions below.
Pack the hot rhubarb into a hot jar (or jars) leaving 1/4 inch headspace. Remove any air bubbles. Wipe the jar rims. Center the lid on the jars, apply the band and adjust to fingertip-tight. Place the jars in the boiling water canner.
Process 1-pint or 1-quart jars for 15 minutes, adjusting for your altitude. Turn off the heat, remove the lid from the canner, and let the jars stand for 5 minutes. Remove the jars and cool.
Once the jars have cooled completely press gently on the center of the lids. If properly canned it should feel firm and look concave. If it moves or makes a popping sound refrigerate that jar and use within 2 weeks.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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