•If you would like to try the mushroom/beef option, start by quartering the mushrooms and pulsing them in a food processor until the mixture resembles large crumbs. You may chop the onion this way, too. Otherwise, you may mince the mushrooms by hand. The food processor just makes quick work of this job.
•Next, sauté the onion and the mushrooms in a couple teaspoons of olive oil over medium heat, stirring occasionally, until the moisture has cooked out of the mushrooms and the mixture is starting to caramelize, about 10 minutes. At this point, add the ground beef and sauté, stirring and breaking up the meat, for another 5 minutes or until the meat is browned. While the beef is cooking, sprinkle with the salt, pepper, and garlic powder.
•Cooking the mushrooms and onions first allows them to really caramelize and develop great flavor.