Chicken with shiitake mushrooms in black pepper and soy sauce

Ingredients:
Chicken breast/whatnot/meatstuff
Shiitake mushrooms, stems removed
Ginger - diced (about an inch)
Garlic - crushed / diced (5 cloves)
Soy sauce (4-5 tablespoons?)
Salt
Black pepper
Onions / other veggies, etc.

(Start cooking rice, you idiot.)
Boil about 2 cups of water, dump in shiitake mushrooms and everything but the chicken. Simmer for about 10? minutes? Until mushroom is tasty and liquids has been infused with shiitake flavor => entire pot contents henceforth referred to as "sauce".
In parallel, while said sauce is simmering, toss chicken onto pan and heat. (Can use frozen chicken breast to save time. Just let it cook half way, then dice up, so the insides cook)
Once chicken is 80% done (not too much red), pour on sauce and mushrooms.. Bring to a boil, then turn off heat. Add more pepper / scallions if desired.

Cook time was approximately 30 minutes?