It's funny, my dad doesn't cut his bell peppers, he tears them with his hands. And he uses the inner ribbing of it, which turns out to be tender and delicious. You basically heat the pan with oil, cook the garlic with the sliced flank steak until almost done, then remove from the heat onto a separate plate. Cook the bell pepper until tender and add the black beans (which, according to Chinese medicine is good for your emotional welfare. "Add more! More!") Add the beef and season with soy sauce.