Storage: The cherry base can be prepared up to one day in advance and stored covered in the refrigerator. The soufflé mixture must be prepared fresh just before baking.
Substitutions: If kirsch is unavailable, you may use a mild cherry liqueur or omit it, though the flavor profile will be less complex.
Variations: For a richer flavor, add a small piece of dark chocolate to the cherry compote while cooking.
Technique: Ensure the soufflé dishes are clean and dry for the best rise. Do not open the oven door during baking.