How to improve contact between non-flat pan and stovetop I have a slightly concave steel paella pan, but I want it to get a nice even heat from my flat glass top stove.  Has anyone had and solved this problem?  First thought is to try to use some aluminum foil to take up the space and (hopefully) conduct the heat well to the pan.
Once I have my solution, what is a good and easy way to test it?  Thinking of testing with a sprinkling of flour and see that it browns evenly
I have one of those pans, and I also have a glass top electric stove, and the answer is that you can't use the pan on the stove.  Not only does it not make good contact, an electric stove is incapable of the rapid temperature changes you need for proper paella, particularly the blast of heat at the end to make the proper socarrat (brown crust).
I recommend that you instead get a portable butane stove, like the one I use, and use that for your paella-making.