Mix your favorite flavoring and let it soak for however many hours you want. The trick isn't to soak it for ages, but for you to create whatever flavoring you want. You should google some ideas on this, there are tons of them, way more than any of us could get to in a million posts.
I think baking soda is used in Chinese cooking to tenderize their meats for stuff like chicken fried rice, but just a little bit is used. You could probably find recipes online that mention use of it!