Blackberry Jam

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Average: 3.8 (16 votes)

We love this jam on warm toast on frosty mornings.

Ingredients

10 cups blackberries
6 cups sugar

Instructions

In a large soup pot over low heat, crush berries until soft.

Pass through a food mill to remove seeds. Return to pot and stir in sugar. Bring to a slow boil, stirring often, until sugar dissolves.

Raise heat to high and cook, stirring often, until mixture reaches 220º on a candy thermometer.

Pour into hot sterilized canning jars (leaving headspace), seal, and process for 20 minutes.

Cooking & Recipes

Yield: 

4 pints

Preparation Time: 

30 minutes

Start to Finish Time: 

1-1/2 hours

Preparation Method

Reader Comments

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blackberry jam

1. can i use less sugar ? about 4 cups?
2. Does it not need pectin or lemon juice?

The sugar is needed for the

The sugar is needed for the jam to gel, however, you can use less sugar. For every cup of fruit you use, you can add ¾ cup of sugar. You don’t have to use pectin. It is a natural gelling agent found in ripe fruit. Some fruit has more pectin than others. Blackberries have high pectin levels.

Making Preserves

Can you use this same recipe to make preserves instead of jam? I would assume you just wouldn't mash the berries.

Yes, Ginny. Not mashing the

Yes, Ginny. Not mashing the berries shouldn’t be a problem.

Blackberry Jam

I do not have a food mill - is there another way I could get the seeds out?

no food mill

Hi, Libby- If you don’t have a food mill, you can use a strainer and wooden spoon. Just push the berries through with the spoon as best as you can.

I have 4 day old

I have 4 day old blackberries, are they still good to use for jam?

That's a hard question to

That's a hard question to answer. The fresher, the better. Blackberries usually last up to a week, so they should be OK. Some folks believe in using a quarter of slightly underripe berries when they make jam but that's a personal preference. See how it goes! Jam is easy to make.

Can you use raspberries for

Can you use raspberries for this recipe? Instead of blackberries

Yes!

Yes!

What is a food mill?

What is a food mill?

I would like to know how many

I would like to know how many cups of blackberries are needed to make one 8 cup batch of cooked jelly?

I did this and it's been a

I did this and it's been a week and it's still runny. Hasn't thickened.

You can save your jam,

You can save your jam, Vicky!
Pour all of the jam into a large pot and set the stove to high heat. Add in 1 tablespoon of powdered pectin as the jam warms up. Cook until the jam is visibly thickened. When your jam is at desired thickness, pour into prepared jars. You will need brand new lids. Process in a boiling water bath for 10 minutes.

What does it mean to process

What does it mean to process in a boiling water bath??

In a boiling-water bath, jars

In a boiling-water bath, jars of food (in this case, jam) are completely covered with boiling water and heated for a specific amount of time. This method is used to safely can tomatoes, fruit, jams, jellies, and pickles with high acid content.

If all jam will be used

If all jam will be used within the next few weeks (giving to family) is water bath needed?

They'll be fine as long as

They'll be fine as long as you sterilize the jars, fill them while hot, and make sure that the lids seal properly.

I have tons of blackberries

I have tons of blackberries and have been looking for a good jam recipe and this one looks like it might be the one.

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