Wash and pit cherries. Combine cherries, sugar, and lemon juice in a bowl and let sit 20–30 minutes to draw out juices.
Transfer mixture to a heavy-bottomed saucepan and simmer over medium heat. If using pectin, stir it in and follow packet directions. For no-pectin, simmer 20–30 minutes until thickened, mashing as desired.
Spoon a bit onto a chilled plate; if it wrinkles when pushed, it’s ready. Remove from heat and stir in vanilla, liqueur, and salt.
Ladle into sterilized jars leaving ¼-inch headspace. Process in a boiling water bath for 10 minutes for shelf stability, or refrigerate and use within 3–4 weeks.
Notes
Adjust sugar based on cherry sweetness; lemon juice preserves color and brightens flavor.
Frozen cherries work—thaw and drain first.
For low-sugar jam, use a pectin formulated for reduced-sugar recipes and follow those instructions.