Add raspberries, maple syrup, lemon juice, and mix.
Bring the mixture to a simmer and smash the raspberries down with the back of a mixing spoon or spatula.
Once simmering, add chia seeds and mix well. Remove from heat and allow to cool for a few minutes before storing in an airtight container in the fridge. The mixture will thicken as it cools (as the chia seeds absorb more liquid).
Video
Notes
This jam should keep for 5-7 days in an airtight container in the fridge.