It's basically a seasoned salt product that is most often used on roast chicken and fried potatoes (think cajun fry seasoning in the USA). Here's a quick "recipe" by one of the alleged inventors of the product. The ingredients he gives are "Salt, msg, paprika, chicken flavoring, onion salt, celery powder, rice flour (as an anti-caking agent), and garlic powder."
I also watched a close to useless VICE video touring the Mitani brand chicken salt factory. The only ingredients that are specifically mentioned "on the record" are salt, rice flour, onion, garlic, and paprika. Plus "secret herbs and spices." The official ingredient list on the label is: "Sea Salt (81%), Rice Flour, Spices, Vegetable Powders (Onion, Garlic), Natural Flavour, Yeast Extract, Anticaking Agent (551)."
