01 - Place berries in medium saucepan over medium heat. Cook, stirring occasionally, until berries break down and release juices, approximately 5 minutes.
02 - Use fork or potato masher to mash berries to preferred texture, whether chunky or smooth.
03 - Stir in maple syrup or honey, chia seeds, vanilla extract, and lemon juice if using. Combine thoroughly.
04 - Remove from heat and let mixture sit for minimum 5 minutes, stirring occasionally. Jam will thicken as chia seeds absorb liquid.
05 - Taste jam and add additional sweetener if desired.
06 - Transfer jam to clean jar. Allow to cool completely before sealing with lid.
07 - Store in refrigerator for up to 1 week. Jam is not shelf-stable and must remain refrigerated.