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In a word..oven. Takes longer but the result is much better. M/wave is OK for some things though. I have a mini oven..a bit like an electric frying pan only hotter and deeper with a grid platform. That is perfect.
I take the food out of the freezer the night before and let it thaw slowly except for bread or raw dough.
Soup I heat in a pan, curry etc I heat in the oven likewise bread.