Spiced Plum Jam | Low Sugar Jam
If you’ve never made homemade plum jam, this Spiced Plum Jam is the perfect place to start. Sweet, juicy plums are paired with warm cinnamon and fragrant cardamom to create a cozy, flavorful jam that’s perfect for late summer and early fall. The spices enhance the natural sweetness of the plums and give the jam a comforting, homemade flavor.
Like all of my homemade jams, this recipe is made with less sugar than traditional recipes, allowing the fresh fruit to truly shine. It’s thickened with Pomona’s Pectin, so you can make a delicious, dependable jam without cups and cups of sugar. The result is a bright, fruit-forward spread that’s just sweet enough.
While this spiced plum jam is wonderful on fresh sourdough toast, homemade biscuits, or stirred into yogurt, my favorite way to enjoy it is on a grilled cheese sandwich. The combination of buttery toasted bread, melty cheese, and the sweet warmth of the cinnamon-cardamom plum jam is absolutely incredible. Once you’ve tried it, you may never look at grilled cheese the same way again.
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Why I Use Pomona’s Pectin
(And Why My Jam Uses Less Sugar)
Not all pectin works the same way — and that’s exactly why most traditional jam recipes require so much sugar.
Most boxed grocery-store pectins are high-methoxyl pectins. They only gel when you combine fruit, a large amount of sugar, acid, and heat in a very specific ratio.
So if you reduce the sugar, the jam won’t set.
Pomona’s Pectin works differently.
Instead of relying on sugar, it uses calcium to create the gel structure. Because of that, the sweetness becomes optional rather than necessary — and that completely changes the flavor, nutrition, and texture of homemade jam.
The Benefits of Pomona’s Pectin
- You can dramatically reduce sugar
Traditional pectin requires your jam or jelly to be 55-85% sugar to set firmly.
Pomona’s is activated by calcium, not by the sugar content. You can sweeten to taste with less sugar, honey, maple syrup, agave, or any other sweetener.
Instead of tasting candy-sweet, the jam actually tastes like fruit. - Cleaner ingredients
Pomona’s is simply pure citrus pectin with calcium — no dextrose fillers, preservatives, or additives. - Better nutrition
Less sugar = lower glycemic impact and a more nourishing spread.
Plus, pectin itself is a soluble fiber (a natural plant fiber found in fruit). So instead of masking fruit with sugar, you keep the nutritional benefits intact. - Brighter fruit flavor & color
Since the jam doesn’t need extended boiling to activate sugar-based gelling, the fruit keeps a fresher taste and deeper color. This is why low-sugar jams taste more like fresh berries than syrup. - Flexible sweetening
Finally, Pomona’s gives complete control over sweetness.
You can use sugar, honey, maple syrup, agave — or adjust batch by batch depending on how sweet the fruit already is.
The Short Version
I use Pomona’s because it lets fruit stay the main ingredient.
It thickens the jam without turning it into dessert, so you actually taste the fruit.
Spiced Plum Jam Ingredients
- Plums – pitted
- Cinnamon
- Cardamon
- Pomona’s Pectin
- Lemon Juice
- Cane Sugar
Equipment/Ingredients I Use
- Pomona’s Pectin
- Immersion Blender
- Ball 8oz jars – any size/style of jars work, I just really love this “quilted” look!
Spiced Plum Jam Instructions
Leaving the skin on provides a rich, deep color and extra flavor.
Prep:
Start by washing and sanitizing your jars and lids in hot water. You can keep the lids in hot water, some say it helps to seal better, but I have tested both ways and have not noticed any difference.
Next wash and pit the plums. (I do not peel.)
Prepare the calcium water by mixing 1/4 tsp calcium powder from the Pomona’s Pectin box with 1/4 cup water. You will not use all of this water mix, you can save it in the fridge for another batch of jam, or simply dump it when done. I find I always have more calcium powder than pectin.
Use an immersion blender to get a nice, smooth jam.
Making the Spiced Plum Jam
Next measure the plums into a pan. Add the lemon juice, cinnamon, and cardamon. Bring to a simmer. We like a smoother jam, so I use an immersion blender to blend till mostly smooth. You can also just mash till it reaches your desired texture, but it helps to blend the peels for a smoother texture. Add calcium water; stir well. Bring the fruit mixture to a full boil.
Meanwhile, measure sugar (or sweetener of choice), add pectin and mix thoroughly.
Once fruit mixture is at a full boil, add the pectin/sweetener. Stir vigorously to dissolve the pectin. Continue stirring until it returns to a full boil. Remove from heat.
At this point I do an optional test to make sure it is the thickness we like. I put a small amount of jam on a spoon and place it in the freezer for a few minutes to cool fully. Remove the test spoon from the freezer and see if it is the thickness that you like. If it is too runny, starting with 1/4 tsp at a time, you can mix more pectin with sugar and add it to the jam. Bring to boil and test again.
Fill your prepared jars with jam, filling to 1/4″ of top. Wipe the rims of the jar well, any food on the rim will effect the ability to seal. Close with the 2-piece lids. You want a finger-tight close to can. If doing hot water bath to seal for longer term storage, follow the next instructions, if not, your jam is ready to cool then refrigerate.
Hot Water Bath
If you want to preserve for later, hot water bath is a very simple process to safely seal your jars, making it shelf stable for at least a year.
Place filled jars in a pot large enough to be able to cover the jars. Fully cover the jars with water and bring to a full boil. Boil for 10 minutes. (add 1 more minute for every 1000 ft above sea level) Remove the jars from the water and let cool. Enjoy the beautiful sound of jars sealing. 🙂 Once cooled check for seals – the lid will be sucked down in the center if sealed. If not sealed refrigerate or freeze.
Disclaimer: This is only a suggested time for hot water bathing, please do your own research. Feel free to check out the USDA website to find the recommended times they give.
Storage
- Refrigerate after opening. The jam should last 3 weeks in the refrigerator.
- Properly canned and sealed jams have a shelf life of a year.
- You can skip the canning process and freeze. Be careful with freezing in glass jars though.
More Low Sugar Jam Recipes
Spiced Plum Jam | Low Sugar Jam
Equipment
- Canning jars
- 1 stick blender
Ingredients
- 4 1/2 cups pitted plums – chopped not peeled
- 1/2 tsp cinnamon
- 1/2 tsp cardamon
- 1/4 cup lemon juice use bottled
- 4 tsp calcium water included in Pomona’s Pectin box
- 3/4 cup cane sugar 1 cup if you prefer sweeter
- 3 tsp Pomona’s Pectin
Instructions
Making the Jam
- Start by washing and sanitizing your jars and lids in hot water. You can keep the lids in hot water, some say it helps to seal better, but I have tested both ways and have not noticed any difference.
- Next wash and pit the plums. (I do not peel.)
- Prepare the calcium water by mixing 1/4 tsp calcium powder from the Pomona’s Pectin box with 1/4 cup water. You will not use all of this water mix, you can save it in the fridge for another batch of jam, or simply dump it when done. I find I always have more calcium powder than pectin.
- Next measure the plums into a pan. Add the lemon juice, cinnamon, and cardamon. Bring to a simmer. We like a smoother jam, so I use an immersion blender to blend till mostly smooth. You can also just mash till it reaches your desired texture, but it helps to blend the peels for a smoother texture. Add calcium water; stir well. Bring the fruit mixture to a full boil.
- Meanwhile, measure sugar (or sweetener of choice), add pectin and mix thoroughly.
- Once fruit mixture is at a full boil, add the pectin/sweetener. Stir vigorously to dissolve the pectin. Continue stirring until it returns to a full boil. Remove from heat.
- Fill your prepared jars with jam, filling to 1/4″ of top. Wipe the rims of the jar well, any food on the rim will effect the ability to seal. Close with the 2-piece lids. You want a finger-tight close to can. If doing hot water bath to seal for longer term storage, follow the next instructions, if not, your jam is ready to cool then refrigerate.
Hot Water Bath Canning
- If you want to preserve for later, hot water bath is a very simple process to safely seal your jars, making it shelf stable for at least a year.
- Place filled jars in a pot large enough to be able to cover the jars. Fully cover the jars with water and bring to a full boil. Boil for 10 minutes. (add 1 more minute for every 1000 ft above sea level) Remove the jars from the water and let cool. Enjoy the beautiful sound of jars sealing. Once cooled check for seals – the lid will be sucked down in the center if sealed. If not sealed refrigerate or freeze.
- Disclaimer: This is only a suggested time for hot water bathing, please do your own research. Feel free to check out the USDA website to find the recommended times they give.
Notes
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