It wont go brown on the top if you put it in the microwave, unless you have one thats also an oven type thingy. Obviously you have to take it out of the metal it comes in too. I dont know if cooking it in the micro is a good idea, but I guess its better than starving.
Actually scrap that, if it's uncooked pastry and uncooked eggs it probably wouldnt work in the microwave. If everything is cooked and you only have to heat up i'd think microwaving it would be ok but if its raw or partially cooked it would probably need to be baked in an oven.
I'm fairly sure you could cook it in a microwave, just would have an odd texture. Failing that, borrow an oven, or fashion a makeshift oven out of a barbecue and a clay pot or something.
i always put pies in the microwave, i'm not gonna bother with 40 mins in the oven for a snack. it just gets a bit soggy it doesn't matter really i just don't wanna eat it cold.