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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:
It will need to cook a little long than unfrozen pasta. Cooked pasta can be stored unsauced in an airtight container and refrigerated for 4 or 5 days. The sauce should be refrigerated separate from the pasta and can be stored for 6 or 7 days.