Storage: The salsa can be made up to 2 days in advance and stored in the refrigerator. Bring to room temperature before serving. Do not store assembled enchiladas as the tortillas will become soggy.
Substitutions: If fresh crab is unavailable, high-quality canned lump crab meat can be used, but be sure to drain it well. You can substitute Monterey Jack for the Jalapeno Jack if you prefer less heat, adding extra serrano to the salsa if desired.
Tips: To make the tortillas easier to roll, warm them in a dry skillet for a few seconds on each side instead of the oven if you are in a hurry. Ensure the crab is not overcooked to maintain its delicate texture.