Add the frozen berries, water, and honey to a small saucepan over medium heat for around 5 minutes, or until the berries are soft and juicy.
Mash the berries with the back of a spoon or a potato masher until they reach your preferred consistency.
Stir in the honey, chia seeds, and a squeeze of lemon juice.
Cook for another 2–3 minutes, stirring frequently.
Remove from the heat and let sit for 5–10 minutes. The chia seeds will continue to absorb the liquid and thicken the jam as it cools.
