In a sink colander, rinse your raspberries well and remove any debris, leaves and dirt.
If desired, use a mesh strainer to remove some of the seeds.
Fill up a canner with water to the level of the handles and transfer it to the stovetop. Turn on the burner to medium-high and let the water warm.
Once washed, measure and then transfer your raspberries into 6-Quart pot.
Measure the exact amount of sugar in a dry measuring cup and set aside. DO NOT REDUCE OR CHANGE THE AMOUNT OF SUGAR AS IT CAN RESULT IN SET FAILURE
Stir in 1 package of Sure-Jell Premium Fruit Pectin (1.75oz), whisk well to combine.
Add 1/2 teaspoon butter to help reduce foaming, if desired.
Bring the mixture to a FULL rolling boil, a boil that does not stop when stirring, on HIGH heat, stirring constantly.
Add the pre-measured sugar to the raspberries and whisk in well.
Return the raspberry mixture to a FULL rolling boil once again and then boil exactly 1 minute, stirring constantly.
Skim off the foam with a metal spoon and discard.
Can the Raspberry Jam
Ladle raspberry jam immediately into prepared jars, filling each within 1/4-inch of the top.
Use a clean rag to wipe the rims clean.
Cover the jars with lids and then screw on the seals to just finger tight, NOT fully tight.
Place the jars in a canning rack and then transfer the rack to the canner. Make sure the water is 1-2 inches ABOVE the jars.
Cover the canner and process the jam for 10 minutes.
Remove the jars, carefully, from the canner and rest them on a towel to cool completely.
Allow the raspberry jam in jars to cool for 24 hours, and then check the seals by pressing your finger on the center of the lid. If a popping noise is present, place that jar in the fridge as the seal did not work.
If the jars are without a popping seal, congratulations! You can now label and store your raspberry jam in a cook, dry, dark place for up to 1 year.
Refrigerate opened jam for up to 3 weeks.
Notes
Allow the raspberry jam in jars to cool for 24 hours, and then check the seals by pressing your finger on the center of the lid. If a popping noise is present, place that jar in the fridge as the seal did not work.Refrigerate opened jam for up to 3 weeks.
Keyword Canned Jam, From Scratch Jam, Jam, Raspberry Jam