Heat plenty of oil in a pan until hot. Add the beef, garlic cloves, and whole green peppercorns. Sear the beef until about 60% cooked, then remove and drain the excess oil.

Using a little of the same oil, sauté the onion and bell peppers. You can add a splash of fish sauce if desired. Return the beef to the pan and stir-fry until fully cooked. Serve hot. This dish goes well with French fries.