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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:
Full Answer. Cooked, refrigerated pasta is easily reheated by dropping it in boiling water for several seconds. Cooked pasta can also be frozen for up to 2 weeks. The pasta should be slightly cooled first and tossed with a bit of cooking or olive oil and placed into airtight freezer bags or containers.