Place the stir-fry back on medium heat. Add in 3 Jjajangmyeon Powder Packets. Stir-fry it around. Once the powder is well mixed into the ingredients, add in 1 scoop of the starch water. Mix it around and let it simmer for 1 minute. (Note: If you want your Jajangmyeon to be more sauce, add-in another scoop of starch water.)