Blackberry jelly is a good first project for anyone learning to make jelly at home. You turn ripe berries into clear juice, cook it with pectin and sugar, and seal it in jars. This guide follows the method printed in the Sure-Jell Original Premium Fruit Pectin recipe, with notes on why each step matters and what to do when something goes wrong.
One important point first: jelly recipes are written around a specific pectin product. Amounts of juice, sugar and pectin are not interchangeable between brands or between “Original” and “less or no sugar” boxes. Use the recipe and the insert that came in your box as the final word. If the two ever disagree with this page, follow the box.
What you need
For one batch, the Sure-Jell recipe calls for:
- 3-3/4 cups prepared blackberry juice (from roughly 2-1/2 quarts of fully ripe berries; boysenberries and dewberries work the same way)
- 1 box Sure-Jell Original Premium Fruit Pectin
- 4-1/2 cups sugar, measured into a separate bowl before you start
- 1/2 teaspoon butter, optional, to reduce foaming
Equipment: a boiling-water canner with a rack, canning jars with new two-piece lids, a large pot (6 to 8 quarts so the mixture has room to boil up), a jelly bag or three layers of damp cheesecloth, a ladle, a funnel, and a jar lifter.
If you are new to water-bath canning in general, read the instructions that come with your canner and the National Center for Home Food Preservation (NCHFP) guidance before you begin.
Making the blackberry juice
- Wash the berries and remove stems and any bad fruit.
- Crush the berries thoroughly, a layer at a time, so they release their juice.
- Place a damp jelly bag or three layers of damp cheesecloth in a large bowl, pour in the crushed fruit, and let the juice drip until it stops. A gentle press at the end is fine according to the Sure-Jell recipe. Squeezing hard tends to push cloudy pulp through.
- Measure exactly 3-3/4 cups of juice into your pot.
Measuring matters. Jelly sets because pectin, sugar and acid are in the right balance, so too much or too little juice can leave you with a soft or overly firm result. If you come up short, the pectin maker’s guidance is to top up with a little water only if the insert allows it; otherwise save the extra juice and make a smaller, separate batch rather than adjusting amounts.
How many cups of juice do you need?
One batch of this recipe uses 3-3/4 cups of juice. As a rough guide, that is about 2-1/2 quarts of berries, though the yield varies with how ripe and juicy the berries are. It is wise to extract a little more than you need and measure from there. Do not double the recipe in one pot; make a second batch instead, because larger volumes can fail to reach a proper set.
Cooking the jelly
- Prepare the canner and jars first. Bring the canner, about half full of water, to a simmer. Because the processing time is under 10 minutes, the jars must be sterilized: wash them, set them on the rack in the canner, cover them with hot water by at least 1 inch, and boil them for 10 minutes (add 1 more minute for each 1,000 feet of elevation above 1,000 feet). Keep the jars hot in the water until you fill them. Wash the bands in hot, soapy water. Pour boiling water over the flat lids in a saucepan off the heat and leave them there until needed.
- Stir the pectin into the measured juice in the large pot. Add the butter if you are using it.
- Bring the mixture to a full rolling boil over high heat, stirring constantly. A full rolling boil is one that keeps bubbling even while you stir.
- Add all the sugar at once, stirring it in. Return to a full rolling boil and boil for exactly 1 minute, stirring constantly.
- Remove from the heat and skim off the foam with a metal spoon.
Work quickly after the sugar goes in. Time the minute carefully, since under-boiling is the most common reason jelly stays runny.
Filling jars and processing
- Ladle the hot jelly right away into the hot jars, leaving 1/4 inch of headspace.
- Wipe the rims and threads clean, put on the lids, and screw the bands on.
- Lower the jars into the canner on the rack. The water should cover the jars by 1 to 2 inches; add boiling water if needed.
- Cover, bring to a gentle boil, and process for 5 minutes (the time in the Sure-Jell recipe).
- Lift the jars out and stand them upright on a towel to cool completely, without tightening or disturbing them.
- Once cool, press the middle of each lid. A lid that springs back has not sealed, so refrigerate that jar and use it first.
Processing times depend on jar size and your altitude. The 5-minute time above is the one printed for this recipe; if you live at higher elevation, check the NCHFP altitude adjustment chart for jams and jellies and add time as directed.
Do I need pectin for blackberry jelly?
Not strictly, but it is the easiest route. Blackberries contain some natural pectin, and fruit that is slightly underripe has more. Traditional long-boil jellies without added pectin can work, but they take more skill, give a smaller yield, and are harder to get right on a first attempt. A boxed pectin like Sure-Jell gives a predictable set with a short boil, which keeps more of the fresh berry flavor.
Do not skip the pectin in a recipe that calls for it, and do not reduce the sugar in a recipe designed for Original pectin. Sugar plays a part in the set and in preservation. If you want less sugar, buy a pectin made for lower-sugar recipes and follow its own instructions.
Jam versus jelly
Jelly is made from strained juice, so it is smooth and clear. Jam includes crushed fruit and pulp; see how to make jam and our Ball-style raspberry jam for that route. Blackberries have a lot of seeds, which is why many people prefer jelly: the seeds stay in the jelly bag. If you have a batch of jam on hand rather than jelly, the same fruit works well in baking, as in our jam breakfast recipes or our jam drops.
If your jelly did not set
Jelly can continue to firm for up to a couple of days, so wait 24 to 48 hours before deciding it has failed. If it is still runny, common causes are:
- Juice, sugar or pectin measured inexactly
- A boil that was not a true full rolling boil, or was shorter than the time called for
- A doubled batch
- Old pectin
Soft jelly is still perfectly good as a syrup over pancakes or ice cream. For re-cooking, follow the remake instructions on your pectin insert or the NCHFP guidance rather than improvising, as the method depends on the pectin type.
Common problems
- Foam on top: The butter helps; skim anything left before ladling. Foam is harmless but can look unattractive.
- Cloudy jelly: Usually from squeezing the jelly bag. Let it drip patiently next time.
- Crystals: Often from undissolved sugar on the pot sides or from too much sugar. Wipe down the pot sides and stir well.
- Floating fruit or weeping: More typical of jam, but can happen if jars are moved before the set firms.
Storing and using your jelly
Store sealed jars in a cool, dark place with the bands removed, and use within a year for best quality. Refrigerate after opening. Any jar that did not seal, or that shows mold, a bad smell or bubbling, should not be eaten.
Blackberry jelly is lovely on toast and biscuits, but also works as a glaze or filling. Try it in jam hamantaschen or jam fingers as a smooth filling, or with cheese as an appetizer, much like the pairing in beer jelly recipes.
FAQ
What is the best recipe for blackberry jelly? For beginners, the box recipe from the pectin maker is a dependable choice because the proportions were tested for that product.
Can I use frozen blackberries? Many people do. Thaw them and extract juice the same way, then measure exactly. Check your pectin insert for any guidance on frozen fruit.
Do I have to water-bath process jelly? Some people ladle jelly into jars and rely on the lid alone, but this is not a method recommended by tested sources. Processing in a boiling-water canner is the safer, recommended approach and is what the Sure-Jell recipe describes. Alternatively, store the jelly in the refrigerator or freezer and skip canning.