Beef with jalapeno

1 1/2 pound beef, flank steak 1 each onion sliced 1 each green bell pepper cut into strips 1 each sweet red bell pepper cut into strips 1 each jalapeño pepper[...]

2 tablespoons cooking oil 2 lbs ground beef 5 shallots , finely chopped 5 garlic cloves 2 -3 red chili peppers , seeded and finely chopped 1 red bell pepper ,[...]