The temperature is inversely proportionnal to the quality of lunch and box but it will be directly proportional to the growth of bacteria thus increasing the chances of food poisoning.  The lower the temperature will be, the higher the quality of the food in the lunch box will be.  Inversely, the higher the temperature would be in the box, the higher the count of bacteria would be, increasing chances of food poisoning. I've had lasagne in my frig for 2 weeks it still taste good. But I'm worried about the frig and frezzing guidlines for it and contamination.please let me know if it's ok to eat. Lasagna will keep in the refrigerator for 4 days but if you would have frozen it, it would have kept for 3 months.  Two weeks is a very long time to keep a perishable food inthe refrigerator.  Throw it out. Can frozen Soy burgers & veggie burgers be refrozen after they have thawed? It depends for how long and how they have been thawed.  If they were thawed in the refrigerator and they still contains ice crystals and they are very cold to the touch, they can be frozen again.  Otherwise, cook them thoroughly and then freeze them if you cannot eat them right away. Hi Mrs. Cookwell.  For a study, I came upon a model to show the temperature evolutio of a food during cooking.  To verify my results, I need to know how to define and determine the ideal cooking temperature. Thank