Hi. I have this problem every time I cook burgers. I always flatten them into nice, perfectly round patties, usually 2 or 3 ounces each, for regular hamburger buns. The problem is, when I fry them (in a pan on the stove) they shrivel up to be way smaller smaller and fatter. I squish them to be about 4" round, then they shrivel to about 3" and get fat in the middle! How do I fix this? I really just want to make some nice burger patties like mcdonald's and everyone else seems to be able to make.