Start by placing the fresh berries and maple syrup in a small saucepan over medium heat. As they warm up, the berries begin releasing their juices. This creates a naturally sweet and fragrant mixture.
Once the berries soften, use a fork or potato masher to crush them. I usually mash them lightly because I like small fruit pieces in my jam. The texture becomes thick and slightly syrupy as the berries break down.
Allow the berry mixture to come to a gentle boil for about one minute. This short cooking step helps concentrate the flavor and soften the fruit completely.
Reduce the heat and stir in the chia seeds and lemon juice. The chia seeds absorb the liquid and begin thickening the mixture naturally, replacing traditional jam thickeners.
Transfer the jam to a clean glass container and allow it to cool at room temperature. As it cools and chills, the chia seeds continue absorbing liquid and the jam becomes thicker.