No added pectin - Ideally, you can make blueberry jam with just two ingredients: blueberries and sugar. Because blueberries have natural acidity and pectin in abundance. And yet, adding lemon juice helps break down on the skin. Low-sugar - Fresh blueberries are naturally soft and sweet. Therefore, you don't need to add a lot of sugar to this jam.
Blueberries are naturally low in pectin. What this means is you will need to add something to help the blueberries gel. In this recipe we use sugar and lemon juice instead of pectin. How long does homemade jam last? Unopened in the fridge the jam will last 2 to 3 months.
To make this sugar-free blueberry jam and keep carbs low, cook the blueberries until they soften and burst. Add low carb sweetener to taste. The most common sweeteners are Erythritol blends, xylitol, and stevia. Put the cooked blueberries in a blender to break up the skins. Pour the fruit puree into a jar, add chia seeds and stir.
If you only have a few cups of blueberries, feel free to cut this recipe in half or quarters. Starting with 4 cups (1 quart) of blueberries and using 1/4 box of pectin will yield just over one 8 oz jar of blueberry jelly. You can also use bottled blueberry juice instead of using the berries yourself.