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1
Place apricots in a heatproof bowl. Cover with boiling water and let stand for 5 to 10 minutes to soften. Drain and rinse, then drain again.
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2
Combine apricots, rhubarb, and sugar in a pot. Cover and let stand at room temperature until fruits release their juices, 8 hours to overnight.
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3
Inspect 6 half-pint jars for cracks and rings for rust, discarding any defective ones. Immerse in simmering water until jam is ready. Wash new, unused lids and rings in warm soapy water.
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4
Bring apricot-rhubarb mixture to a boil over medium heat. Reduce heat to medium-low, cover, and simmer until rhubarb is tender and starts falling apart, about 3 minutes. Stir in pectin and bring mixture to a full rolling boil on high heat. Boil for exactly 1 minute, stirring constantly. Remove from heat. Skim off any foam with a ladle or a large spoon.
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5
Pack rhubarb-apricot jam into the prepared jars, filling to within 1/4 inch of the top. Run a clean knife or thin spatula around the insides of the jars to remove any air bubbles. Wipe rims with a moist paper towel to remove any spills. Top with lids and tightly screw on rings.
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6
Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil and lower jars 2 inches apart into the boiling water using a holder. Pour in more boiling water to cover jars by at least 1 inch. Bring to a rolling boil, cover, and process for 10 minutes.
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7
Remove the jars from the stockpot and place onto a cloth-covered or wood surface, several inches apart. Let rest for 24 hours without moving the jars. Gently press the center of each lid with a finger to ensure the lid does not move up or down. Remove the rings for storage and store in a cool, dark area.
