1 tablespoon vegetable oil
2 tablespoons grated fresh ginger
1 stalk lemon grass, minced
2 teaspoons red curry paste
4 cups chicken broth
3 tablespoons fish sauce
1 tablespoon light brown sugar

3 (13.5 ounce) cans coconut milk
1/2 pound fresh shiitake mushrooms, sliced
1 pound medium shrimp - peeled and deveined
2 tablespoons fresh lime juice
salt to taste
1/4 cup chopped fresh cilantro