Red currant jelly comes together with just two ingredients ~ fruit and sugar. Since the currants are naturally high in pectin and acidic, there's no need to add lemon juice or commercial pectin.
4cupsred currant juicefrom 4lbs fruit, about 16 cups, unstemmed
4cupssugar
Instructions
Place the unstemmed red currants into a saucepan with water (1/2 cup per pound or 2 cups total for this recipe). Bring the fruit to a boil, mashing the fruit to encourage the red currants to release their juices. Simmer 1-2 minutes and turn off the heat.
Pour the fruit pulp into a jelly bag (or cheesecloth-lined strainer) and allow the mixture to drip for several hours (or overnight). Squeezing the bag will result in a higher yield, but might affect the jelly clarity (it didn't affect mine, I squeezed).
Measure the resulting juice. For each cup of red currant juice, add 1 cup sugar.
(Optional) If canning, prepare a water bath canner.
Place the juice/sugar mixture into a jelly pot and bring to a boil on high heat. Boil hard for 5-10 minutes, until the jelly is set. (Test for set on a plate that's been placed in the freezer, see picture above. Or, test for the gel stage with an instant-read thermometer. The gel stage is 220 degrees F at sea level. See notes for higher altitudes.)
When the jelly reaches gel stage, remove from heat and pour into jars, leaving 1/4 inch headspace.
For a refrigerator jam, cap and allow the jars to cool to room temperature before storing in the refrigerator for use within a month.
If canning, cap with 2 part canning lids and process the jars in a water bath canner for 10 minutes. Turn off the heat and allow the jars to sit in the canner for 5 more minutes before removing to cool on a towel on the counter. After 24 hours, check seals and store unsealed jars in the refrigerator for immediate use. Sealed jars can be stored in the pantry for 12-18 months.
Notes
The temperature for gel stage is 8 degrees above the boiling point of water, or 220 degrees F at sea level. That drops by a degree for every 500 feet above sea level. For example, I'm at 1000 feet elevation, so my finish temperature is 218 F.For a low sugar redcurrant jelly, you can reduce the sugar to 1/2 cup per cup of juice. It'll be tart, yields will be reduced, and you'll need to cook the jelly longer (15-20 minutes).