Add the blueberries, lemon zest, lemon juice and maple syrup to a large pot over medium high heat. Stir occasionally, until the blueberries begin to burst, about 5 minutes.

Use the back of a spoon to lightly mash roughly half of the berries, releasing their juice.

Turn the heat up to medium-high and bring the mixture to a boil. Stir occasionally, for 5 to 10 minutes, or until the mixture has reduced by half. Stir in your chia seeds and cook for 1 minute.

Remove from heat and let cool slightly.

Clean the rim and threads of the jars using a clean, damp paper towel.

Add the lid on top of each jar, allowing the reddish sealing compound to come in contact with the jar rim. Add the band and twist until its fingertip tight.