Sweet Soy Glazed Salmon

Ingredients:
1 large piece boneless skinless salmon (3/4 lb.)
1 green onion
¼ piece ginger
4 fresh shiitake mushrooms

Sauce (glaze) Ingredients:
¼ cup dry sherry
2 tbsp regular soy sauce
2 tbsp white sugar
1 tbsp thick dark soy sauce
1 tbsp cornstarch