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If it is a commercially frozen lasagna, it should be kept in the freezer until it is taken out to be cooked. Once it has been cooked, the leftover lasagna can be kept safely in the refrigerator for up to two days in a covered container. Learn more about Food Spoilage Sources:
Summing things up, refrigeration can keep your cooked shrimp fresh and safe to eat within 3 to 4 days. Freezing, on the other hand, can extend the shelf life of cooked shrimp up to an indefinite period. There are several recipes, though, which you can try to salvage frozen cooked shrimp. You can use it for a tomato and shrimp stew.