Japanese food has a lot of Chinese influence and we often cook "our" version of Chinese food at home. Pepper steak is no exception. During my first year of marriage, my Taiwanese American husband was shocked to see bamboo shoot in my Pepper Steak. Well, bamboo shoot is a typical ingredient in our version of Pepper Steak. This time I added potatoes because I thought the sauce would go well with potatoes. My husband told me, "you are supposed to put bamboo shoot, not potatoes." I told him that's the Japanese version of Pepper Steak, but he didn't believe me until I Googled original Pepper Steak recipe. After being married for 6 years his Chinese taste buds are slowly adapting to the Japanese-Chinese food taste. Well, whatever ingredients you might try, you can cook this dish very fast. Just chop everything before you stir fry and cook quickly over high heat. Before you realize, you are already working on your second bowl of rice. Yum!