Sirloin steak cut up in 1/2 squares in teriyaki sauce overnight in refrigerator overnight. In an electric frying pan brown meat until fork tender. Add sauce that meat was marinaded in about 200 degrees. Then add pineapple chunks. Last 1/2 tablespoon cornstarch in 1 cup of pineapple juice stir and mix well. Then add to meat and pineapple chunks.