1Make the sauce by mixing soy sauce, gochujang, sesame oil, sesame seeds, dark soy sauce, sugar, minced ginger, and minced garlic. Grate a skinless apple and add it to the sauce.
2Slice one medium onion.
3Heat olive oil in a frying pan and add the sliced onions. Cook until lightly browned.
4Add the ground beef to the pan. Season with salt and pepper.
5Cook the beef until browned and drain some beef fat.
6Lower the heat, add the sauce and stir until the sugar caramelizes.