In a small saucepan, combine tart cherries, maple syrup, and water. Cover saucepan and bring to a boil over medium heat.
Remove lid and reduce to a simmer for 10-12 minutes (or until cherries start to break apart.)
Remove from heat. Add chia seeds, lemon juice, and vanilla.
Place in a mason jar or small container. Refrigerate. (Jam will thicken as it sits.)