Rinse, hull, and chop the strawberries.
Warm strawberries, water, and salt in a saucepan over medium heat, stirring until juicy and bubbling, 6–8 minutes.
Mash fruit with a fork or potato masher to your preferred texture.
Stir in honey and lemon juice. Taste and adjust sweetness if needed.
Sprinkle in chia seeds while stirring. Cook 1 minute, then turn off the heat.
Let the jam stand 10–15 minutes to thicken, then stir in vanilla.
Transfer to a clean jar, cool completely, and refrigerate.