Step 1

Preheat the oven to 350°F.Pulse the onion in a food processor until very fine

Step 2

Dump the onions out onto the center of a thin kitchen towel set over a colander, gather up the ends of the towel, and squeeze out the liquid from the onions over the colander or sink.Place the onions into a mixing bowl along with the lamb, beef, garlic, oregano, cumin, garlic powder, thyme, black pepper, salt and olive oil

Step 3

Mix well with your hands until mostly combined.Place the meat mixture into the food processor, and pulse until finely chopped and the mixture resembles a coarse paste, about 2 minutes.Pack the meat mixture into a 9x5 inch loaf pan, press the meat mixture down firmly making sure there are no air pockets.Bake until the gyro meat reaches an internal temperature of 165° F on an instant read meat thermometer, about 50-60 minutes

Step 4

RESERVE ALL PAN JUICES.Let the meat cool for 20-30 ,minutes before slicing very thinly.This last step is optional

Step 5

Before serving, fry the sliced gyro meat in a little of the pan juices in a skillet set over medium heat