In a bowl add garlic brown sugar soy sauce cornstarch and mix well.pour half and mix on the beef and let rest.in your pan with olive oil add broccoli and cook for a minute.remove the broccoli and allow to rest.add hour beef to the pan evenly and cook on both side for 3 minutes to it Browns and remove.in the same pan add the rest of the sauce with the oyster sauce ,broth and cook untill it thickens.once thick add the beef and broccoli and simmer for about ten minutes.watch it so it won't stick or burn and enjoy.