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Best enjoyed fresh from the oven.
Leftovers can be stored in the fridge for up to 2 days.
Reheat in the oven for best texture.
Variations:
Add scallops or squid for more seafood variety.
Use a mix of cheddar and parmesan for a stronger cheese flavor.
Add spinach or leeks to the gratin for extra vegetables.
FAQ:
Q: Can I make this dish ahead of time?
A: Yes, you can assemble it a few hours in advance and bake it just before serving.
Q: Can I freeze the gratin?
A: Freezing is not recommended due to the cream sauce, which may separate.
Q: What can I use instead of mussels?
A: You can substitute with cooked clams or more shrimp.
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