Bring to a boil that can not be stirred down, stirring constantly.
Once boiling, add the remainder of the sugar all at once. Stir constantly until it comes to another full rolling boil (one that can’t be stirred down). Boil one full minute.
Remove from heat. Skim foam if needed. Most of the time, if you keep stirring for a couple minutes after you remove the pot from the heat, you can stir the foam down.
For canner
Heat your jars, lids and canning pot before starting with the jam. For more information on how to easily do this, see our canning for beginners article here.
Ladle hot jam into hot canning jars using a canning funnel and ladle, leaving ½ inch headspace. (the space between the marmalade and the rim of the jar.)
Remove air bubbles with wooden or plastic chop stick or similar tool.
Wipe rims of all debris with a clean, damp cloth or towel.
Center lids on jars.
Screw on bands fingertip tight.
Place jars on the rack in your boiling water bath canning pot. Bring to a boil. Process jars for 10 minutes. Set timer after water has come to a boil.
Once time is up, remove canning pot from burner. Allow jars to sit in the hot water for at least 5-10 minutes so they can start to cool down slowly. This will minimize siphoning.
Remove the jars from the water and place on counter. Leave them for 12-24 hours and then test the lids for a seal. Press the lid in the center. If it flexes up or down, jar is not sealed and should be stored in the refrigerator and used first.
Notes
Makes about 5 half pint jars
Adjust your processing time for altitude. See below.
Recipe can be multiplied but do not do more than 5 times the recipe as written.
Pro tip - Whenever canning prepare an extra jar and lid in case your measurements or cooking times yields a different amount that the recipe you are using.Altitude adjustment0-1000 feet - 10 minutes1000-3000 feet - 15 minutes3000-6000 feet - 20 minutesabove 6000 feet - 25 minutes