This sugar-free raspberry jam is thick, jammy, and perfectly sweetened. It’s shelf-stable for up to a year when canned properly, making it an ideal pantry staple.
If you have a glut of raspberries, make this jam to use as a filling or topping for low‑carb baking. I developed this recipe to pair with coconut raspberry slices, but it works equally well on cheesecakes, in tart shells, or in thumbprint cookies.
This jam is naturally gluten‑free, low‑carb, and keto‑friendly. There is no added cane or granulated sugar—only the fruit’s natural sugars and your choice of a low‑carb sweetener.
Why canning extra jam is a great idea
Jam is far more versatile than just spreading on bread. It’s a convenient raspberry filling for many desserts and savory applications—think cheesecake topping, cake filling, tart filling, or cookies. Having a shelf‑stable jar on hand makes assembling desserts quick and easy.
Making your own jam lets you control every ingredient, including the amount and type of sweetener. Homemade jam avoids strange additives and gives you a clean fruit flavor. It’s also economical compared to store‑bought sugar‑free jars.
About pectin and low‑carb jams
Pectin often gets a bad reputation in low‑carb circles because many commercial pectins require sugar to gel. The solution is a true low‑sugar pectin that gels with calcium instead of sugar.
Pomona’s Universal Pectin is a 100% pure pectin that requires calcium to gel. It includes a small packet of calcium powder that you mix with water to create “calcium water.” That calcium water is added to recipes to activate the pectin, so no sugar is required for gelling.
Pomona’s pectin is vegan, gluten‑free, and non‑GMO. According to the manufacturer, one teaspoon (3 grams) contains about 2.55 g carbohydrate (from soluble fiber) and 2.5 g soluble fiber. This recipe uses only a small fraction of that, so the carb contribution from pectin is negligible.
How Pomona’s pectin works
Pomona’s system requires mixing the calcium powder into a little water to make calcium water, which you keep refrigerated. You add a teaspoon or two of that calcium water to your jam when instructed. There are two pectin types: those that require sugar to gel and those that require calcium. Pomona’s uses calcium, so you can make shelf‑stable, low‑sugar jams.
The pectin is forgiving: if a batch doesn’t set as expected you can adjust by adding more calcium water or pectin and reprocessing. The package includes clear instructions, and Pomona’s website offers recipes and troubleshooting guidance. One box makes many jars, so it’s cost effective in the long run.
Using Pomona’s pectin: tips
- Use filtered water if possible. Hard water can add extra calcium and affect how firmly the jam gels.
Best sweeteners for this low‑carb raspberry jam
I tested a variety of sweeteners: stevia, Swerve, xylitol, erythritol, monk fruit/erythritol blends, allulose, and Truvia. All worked to some degree, but textures and flavors differed.
Allulose produced the best result: the jam had a glossy, sticky, classic jam texture and a true jam flavor. Erythritol can become grainy when cold; warming restores smoothness. Monk fruit blends were mostly good with only minor graining. Xylitol worked well but adds more carbs. Stevia, Truvia, and Swerve gelled fine but may leave an aftertaste for some people.
Important: xylitol is toxic to dogs and cats—do not use it if pets may access the jam.
Essential canning safety tips
Follow these safety steps to ensure shelf stability and food safety:
- Do not skip the lemon juice. Use bottled lemon juice for consistent acidity; fresh lemons vary and can affect safety and gelling.
- Do not use jars larger than 500 ml (2 cups) for this recipe.
- After processing, leave jars undisturbed for 24 hours—do not move or tilt them while cooling.
- If a jar fails to seal, you can reprocess it in the water bath for another 10 minutes or refrigerate that jar for up to three weeks.
- This recipe requires a full 10‑minute boiling water bath to seal the jars—do not skip this step.
Storage and uses
Store sealed jars in a cool, dark place for up to one year. Once opened, keep jars refrigerated and use within three weeks. Use this jam as a topping, filling, or in any recipe that benefits from a bright raspberry flavor.
More sugar‑free, shelf‑stable jam ideas
If you enjoy this jam, consider trying other shelf‑stable sugar‑free recipes like blueberry, cherry, or strawberry jam—all adapted to work with Pomona’s pectin and low‑carb sweeteners.
Recipe card
Sugar‑Free Raspberry Jam – Shelf Stable, Low Carb and Delicious!
A tart yet sweet raspberry jam made without granulated sugar. Shelf‑stable for up to a year when properly canned and adaptable to your preferred low‑carb sweetener.
Ingredients
- 4 cups mashed raspberries (about 8 cups whole raspberries)
- 2 tsp calcium water
- 2 tsp Pomona’s pectin powder
- 1 tsp vanilla
- 2 Tbsp bottled lemon juice
- 3/4 cup allulose (or your preferred low‑carb sweetener, adjusted to taste)
Instructions
- Wash jars, lids, and bands. Place jars in a water bath canner filled halfway with water, bring to a boil, then turn off the heat and leave jars in the canner until ready to use.
- Warm lids in simmering water and keep them warm until ready to use.
- If using fresh raspberries, rinse and remove debris. If using frozen, measure and add frozen berries directly to the pot.
- Add lemon juice and calcium water to the raspberries and mix well.
- Combine the pectin powder and sweetener in a bowl and mix thoroughly.
- Heat the raspberries until they begin to soften, then mash to your preferred consistency. Bring the fruit to a boil.
- Stir in the pectin‑sweetener mixture and continue stirring for 1–2 minutes to dissolve the pectin as the jam returns to a boil. Boil for 1 full minute once boiling is reached.
- Fill jars to 1/4″ from the top, wipe rims clean, and apply lids and bands.
- Place jars into the boiling water bath and process for 10 full minutes (add 1 minute per 1,000 ft elevation as needed).
- Remove jars and let cool undisturbed for 24 hours. Test seals; any unsealed jars can be reprocessed or refrigerated and used within three weeks.
Notes
This recipe was adapted from Pomona’s raspberry jam instructions and tested using allulose. Adjust sweetener to taste; texture and flavor vary slightly with different sweeteners.
Nutrition Information:
Yield: 64
Serving Size: 1 TBS
Amount Per Serving:
Calories: 5
Carbohydrates: 1.3g
Net Carbohydrates: 0.6g
Fiber: 0.7g
Nutrition information is approximate. Sugar alcohols such as erythritol are often treated differently in net carb calculations; adjust based on your tracking method.
