Place the pieces of meat on a parchment-lined baking sheet, and place the onion from the marinade on top. Bake in a preheated 200 degree oven for 30 minutes. You can cover the top with foil. While the meat is cooking, cut the garlic into thin slices and grate the cheese on a coarse grater. Take out the meat, distribute the chopped garlic and sprinkle with cheese, send it to the oven for another 10 minutes.