Combine rhubarb and sugar in large heavy saucepan. Grind oranges including the peels in a food processor. Add to rhubarb mixture. Bring to a boil. Reduce heat and simmer, uncovered, stirring often until marmalade sheets from a spoon, about 1 hour. Pour into hot jars, leaving 1/4 inch head space. Adjust caps. Process in boiling water bath for 10 minutes. Makes about 8 half pints.
By Robin from Washington, IA
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Cut 4 cups of rhubarb into 1 inch pieces and put into granite, not aluminum, pan. Add 4 cups sugar; let stand about 1/2 hour. Cook on medium heat until rhubarb is dissolved.
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In a large pot combine all ingredients. Bring to a boil. Boil rapids for 25 or 30 minutes, stirring frequently, until thick.