Surin's Coconut Soup - steve sartino : i am always thirsty

Ingredients

• 1 tablespoon canola oil
• 3 tablespoons lemongrass, outer sheath removed, bottom 3 inches trimmed and minced
• 2 tablespoons fresh ginger, minced
• 1 garlic clove, minced
• 2 -3 teaspoons Thai red curry paste
• 6 cups chicken stock
• 3 tablespoons fish sauce or 3 tablespoons soy sauce
• 1 tablespoon sugar
• 2 (14 ounce) cans unsweetened coconut milk
• 12 ounces boneless skinless chicken breasts, cut into 1 by 1/4-inch strips
• 1 (15 ounce) can straw mushrooms, drained and rinsed
• 3 tablespoons lime juice
• salt
• 1⁄2 cup whole fresh cilantro leaves, loosely packed
• 3 scallions, greens only, sliced thin