Step 4: Cool and Store
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Once the jam has thickened, remove from heat and let it cool slightly.
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Pour into sterilized jars, leaving about ¼-inch headspace.
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Seal with lids and allow to cool at room temperature.
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Once cool, refrigerate for up to 3 weeks, or process in a hot water bath for shelf-stable storage (up to 1 year).
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Tips for Success
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Taste as you go. Depending on your rhubarb and blueberry sweetness, you may want to adjust the sugar.
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No pectin? This jam will still thicken naturally thanks to the fruit’s natural pectin. Just simmer a bit longer.
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Sterilize your jars if canning: boil jars and lids for 10 minutes, then fill while hot.
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Ways to Use Blueberry Rhubarb Jam
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Spread on gluten-free toast or English muffins
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Swirled into oatmeal or yogurt
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As a topping for pancakes or waffles
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Use it as a filling in pies, tarts, or pop-tarts
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Add to a cheese board for a sweet/tart contrast
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Stir into cocktails or lemonade for a fruity twist
Nutrition Information (Per Tablespoon)
| Nutrient | Amount |
|---|---|
| Calories | ~40 |
| Carbohydrates | ~10g |
| Sugar | ~9g |
| Fiber | 0.5g |
| Protein | 0g |
| Fat | 0g |
| Sodium | 1mg |
Note: Actual nutrition will vary based on how long the jam is reduced and how much sugar is used.