I don’t know about everyone else, but I have always found that re-heating lasagna is tricky. It’s dense and so getting the middle hot enough without overcooking the noodles or drying the dish out is what I often have problems with. It so happens that we have this very large roasting pan with a rack in it that we only use maybe 2-3 times per year. On the other hand, when we need it, we need it and when we bought the new appliances, I specifically wanted a stove with a lower drawer for that pan.
It occurred to me that as deep as the roasting pan was, maybe I could reheat the lasagna in a water bath. Hubby looked at me as if I was being only mildly silly because he’s never shared my concern about how the dish re-heats. So, I took the rack out and did the displacement deal with putting water in the pan and placing the lasagna dish in it to discover that I had to pour a little water out. I then set the tightly foiled covered lasagna dish on the counter for that to come up to room temperature while the water in the roasting pan heated at 350. That took about twenty minutes and I very carefully set the baking dish into the hot water and let it all go for another thirty minutes. It was almost perfect and next I’ll let it stay in the oven for thirty-five minutes. Not everyone will want to mess with this, but it worked for me.