1. cut the pork tenderloin into one centimeter strips, add a beaten egg, chicken broth, a little wine, salt, pepper, marinate for ten minutes. 2. while marinating time to prepare sweet and sour sauce, water, vinegar, sugar, soy sauce, cooking wine, the ratio of 5:4:3:2:1. mix well and standby. 3. marinated tenderloin add cornstarch and mix well. 4. pineapple cut into small pieces, I used canned pineapple Oh. 5. . pan hot oil burned to eighty percent heat, into the meat strips, fried to white fish out. 6. frying pan again to eighty percent heat, again into the meat strips, re-fried to golden brown fish out, this is very critical Oh, the fire must not be too big, so as not to fry the old. 7. pot to stay a little oil, hot pour sweet and sour sauce, add pineapple pieces, burned to bubbling, add the tenderloin, if you think it's not sticky enough, you can blend a little water starch, oh, stir fry! Even can be out of the pot, very rice a dish Oh!