Easy Rhubarb Jam Recipe (2024)

If you have a garden full of rhubarb, or can find a few big bunches at the market, you need to make this sweet and tart, rhubarb jam.

My kids love ‘toast with jam’ for breakfast. Even my ‘selective’ eater (she is not ‘picky’ she simply finds food difficult), will often eat four slices of toast with ham for breakfast… and another four for lunch! She loves it!

It may not be the most nutritious option, but for a child who struggles with eating in general, it’s an option we can work with, making enough homemade jam to meet demand is a struggle though!

My husband is usually the jam maker in our house (because I have a history of burning it and ruining the entire batch!), but when our stash of homemade berry jam runs out midwinter, it’s time for me to step in with another option.

We have a garden overflowing with rhubarb at this time of year, so it was time to make some rhubarb jam.

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Rhubarb jam is sweet, tart, earthy, and gloriously pink!

And when I say ‘earthy’ I am not trying to be all fancy, there is really is something earthy about the taste of rhubarb. One of my kids says “it tastes a little like dirt… really yummy dirt!”

But the best thing about rhubarb jam is that it’s really easy to make, so easy that even I didn’t muck it up!

Preparing Jars for Jam.

Before you start to make the jam you need some jars to put it in.

We use recycled jars with their matching lids, but you can buy special canning jars and lids which would be better if you plan to store your jam for a long time, or give it as gifts.

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Whatever jars and lids you use, they need to be VERY clean. We run ours through the dishwasher on a hot cycle then we put the wet jars into a moderate oven to heat sterilise them for about 30 minutes, while leaving the lids to cool and dry.

You need the jars to be quite hot when you put the jam into them (so the hot jam doesn’t crack the cold glass), so either time the heating of your jars right or just turn the oven back on 5 minutes or so before you jam is done so the jars are toast warm when you fill them.

Rhubarb Jam Recipe

This recipe makes a fairly small amount of jam, just 3-4 medium sized jars full, and you can easily half the recipe if you don’t have quite enough rhubarb, or double it if you have lots. It’s perfect to use up a big harvest if you grow your own rhubarb, or to make just one or two jars if you only have a small amount.

You’ll need a large pot to cook the jam in and a bit of time to tend to it, but it’s really simple to make, and well worth the effort.

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Rhubarb Jam

Yield: 4 medium jars

Prep Time: 5 minutes

Cook Time: 30 minutes

Total Time: 35 minutes

Rhubarb jam is sweet, tart, and really easy to make!

Ingredients

  • 1kg chopped rhubarb
  • 1 kg sugar
  • juice of one lemon

Instructions

  1. Wash and chop your rhubarb into small pieces.
  2. In a large pot combine the rhubarb, sugar and lemon, and leave it to sit for an hour or so until the juices begin to seep out of the rhubarb. (You can leave it over night, but put it in a non-reactive ceramic or plastic bowl if you want to do that)
  3. Put the pot on a low heat and stir often until the sugar has dissolved and the rhubarb begins to break down. Have a quick taste and add more lemon if you like it really sour like we do.
  4. Turn up the heat a little until the jam is just simmering and cook, stirring often, until the jam begins to thicken.
  5. This will take around 10-15 minutes and you'll notice the mixture gets noticeably thicker. Once you a re leaving a trail in the mixture with your spoon it is time to put it into the jars.
  6. Carefully pour the hot jam into sterilised, warmed, jars, leaving about a centimetre at the top. Pop the lids on tight.

Notes

This only makes a small amount of jam, and you can easily half the recipe if you don’t have as much rhubarb on hand.


Please note: this recipe uses Australian measurements and temperatures, if you need to convert measurements or temperatures you can find our printable cooking conversion chart here.

Some people suggest to invert the jars of jam once you have filled them, but we don’t do that. As the jars cool they seal well and usually suck the ‘button’ down on the top of the lids. Any jars with buttons that haven’t been sucked in we either eat straight away or put in the fridge.

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It’s fabulous to have something so bright pink and fresh, it’s like a little bit of summer in the middle of winter!

If you still have some rhubarb you need to use up, you might like these recipes:

Lemon and Rhubarb Cookies
Rhubarb and Apple Scrolls
Apple and Rhubarb Slice

Plum and Rhubarb Cake.
Rhubarb Tea Cake
Lemon and Rhubarb Scones.

Easy Rhubarb Jam Recipe (2024)

FAQs

Does lemon juice thicken jam? ›

With a simple lemon juice trick, your homemade jam will achieve your desired thick texture. Preparing jam is about capturing the sweet essence of the fruit while simultaneously cooking it down to the perfect syrupy consistency.

How to get jam to set without pectin? ›

The secret ingredient to making jam without pectin is time. The fruit and sugar need plenty of time to cook and thicken. A long, slow boil drives the moisture out of the fruit, helping to preserve and thicken it at the same time. Fruit varies in water content as well, and some fruits may take longer to jam up.

How to thicken rhubarb jam? ›

5 Ways to Thicken Homemade Jam
  1. Just wait. You've followed the recipe and even tested the jam for thickness by smearing a bit of the cooked jam on a cold spoon straight from the freezer, but it still looks runny in the canning jars after processing. ...
  2. Add chia seeds. ...
  3. Cook it again. ...
  4. Add pectin. ...
  5. Cook it in a low oven.
Sep 5, 2023

Does rhubarb have a lot of pectin? ›

Because rhubarb doesn't have much pectin, and often add apple juice which helps the jam to set nicely. In a large pot, mix the rhubarb, berries, and the water or apple juice.

What happens if you don't put lemon juice in jam? ›

It's Not Only About Pectin

There's another reason why lemon juice is added to most jam recipes: for safe canning and to prevent the growth of bacteria. Bringing the pH level down means jars can be sealed in a regular boiling water bath in a reasonable amount of time (sometimes as little as 10 minutes).

Why put lemon juice in homemade jam? ›

Adding acid in the form of fresh lemon or lime juice is important for two reasons: First, it makes for a more well-balanced jam, returning some of the acidity lost with the addition of sugar. Second, pectin needs acid to properly activate, or firm up.

What is the best thickener for jam? ›

If you really want to thicken it to a more spreadable consistency, the easiest way is to heat it up with some thickeners such as cornstarch. Arrowroot flour is more delicate and taste-neutral, but most cooks won't have it. Unflavored gelatin may also be used. Bring the syrupy “jam” to boil in a pot.

How to fix a jam that didn't set? ›

If it still hasn't set, it's time to determine how much jam needs to be recooked. You don't want to remake more than 8 cups (4 pints) at a time. For every 4 cups of jam that needs to be remade, whisk together 1/4 cup sugar and 1 tablespoon powdered pectin.

What to use instead of pectin? ›

Cornstarch - Another plant-based thickening agent, cornstarch is a great substitute for pectin. Gelatin - For non-vegan menu items, you can substitute gelatin for pectin, but it will yield a different consistency.

Why can't you eat too much rhubarb? ›

Rhubarb is high in calcium oxalate. While the substance is mainly in the leaves, it's also found in the stalks. Too much calcium oxalate in your diet may lead to hyperoxaluria, which is the buildup of oxalate crystals in different organs.

Why did my rhubarb jam not set? ›

Jam that was not heated to 104C-105C will not be set. In this is the case, heat the jam again. Use a jam thermometer to check when it reaches temperature. However, if the jam has been heated sufficiently, but still did not set, then it requires more pectin and acid.

Why is my rhubarb jam stringy? ›

Rhubarb can also become woody and stringy if it isn't harvested soon enough, so try to avoid stalks that are wider than 1-inch.

How do I get my jam to thicken? ›

For every 4 cups of jam that needs to be remade, whisk together 1/4 cup sugar and 1 tablespoon powdered pectin. Pour the jam into a low, wide pan and add the sugar and pectin combo. Stir until the sugar and pectin has dissolved.

Can I use lemon juice instead of pectin in jam? ›

Although we are not adding powdered pectin, we will add citric acid or lemon juice to the jam. This gives an additional pop of pectin but also some acidity that balances the sweetness of the jam. Citric acid provides very consistent results, which is why I like to use it.

Does lemon juice thicken? ›

Turns out, the acidity of the juice acts as a thickening agent, which reacts with the proteins in the dairy to increase the viscosity. It's a similar concept to adding vinegar to milk to make buttermilk, said Clark. Once combined, it was time for parm—18-month DOP Parmigiano Reggiano Cheese to be exact.

Can you use bottled lemon juice to set jam? ›

By using bottled juice, you ensure that your preserves have a consistent level of acidity, which makes them safe for canning. And when making jams or jellies, the degree of acidity in any citrus juice added affects the natural fruit pectin's ability to gel.

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