cream of mushroom soup(201212127 park min hyeok)

• 1 pound regular white mushrooms, cleaned, quartered or sliced
• 1 Tbsp lemon juice
• 1 Tbsp unsalted butter
• 2 Tbsp minced shallots
• 1 Tbsp chopped fresh thyme or 1 teaspoon dried thyme
• 1/2 bay leaf
• 1 teaspoon salt
• 1/2 teaspoon fresh ground pepper
• 2 cups heavy cream
• 1 1/2 cups chicken stock
• 1 teaspoon cornstarch dissolved in 1 Tbsp water
• Minced parsley for garnish