Chinese Egg Drop Soup

INGREDIENTS

• 6 shiitake mushrooms, thinly sliced
• 6 cups chicken or vegetable stock
• 1 tablespoon Chinese rice wine or dry sherry
• 1 teaspoon grated fresh ginger
• 1/2 teaspoon salt (or to taste)
• 1/4 teaspoon ground white pepper (or to taste)
• 1 tablespoon cornstarch, dissolved in 3 tablespoons water
• 1 large egg
• handful thinly sliced green onion