Cut the pork down the middle (in half) and add to a bowl with the lemon-lime soda. Allow to soak for at least 10 minutes. Drain out the soda.
Put the 1/2 onion, garlic, ginger, green onion and pineapple in a blender and blend on medium low. Pour into the bowl with the pork and add the gochujang, sugar, mirin, soy sauce, Korean fine chili powder and sesame oil. Allow the pork to marinate for 12 hours.
Heat up a pan and add vegetable oil. Lay the pork carefully in the pan (don't pile the pork--make sure every piece is touching the pan). Cook until the meat is firm, about 15 minutes. Add a touch of salt, sliced onions and thinly sliced carrots (matchstick.) Then, cook for another 5 to 10 minutes.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.