You CAN brown the frozen hamburger Stick a little oil in a biggish fry pan and heat to medium. Put in the frozen burger and brown the slab. Turn it over and use a spatula to scrape off the browned part while the other side browns. Keep doing this over and over until all the meat is browned! It'll brown a whole pound in about 10-15 minutes - not much longer than the microwave, maybe faster - honest There IS life without a microwave-trust me on this

While the meat is browning, you can chop up the burrito fixins.