Steamed Breast Of Chicken With Black Mushroom

• 8 nami black mushrooms (dried)
• 8 water chestnuts
• 2 green onions
• 2 garlic (cloves)
• 1 chicken breast
• 1 chinese sausage
• 30 ml dry sherry
• 30 ml soy sauce (thin)
• 8 gr cornstarch
• 5 ml sesame oil