Oriental Soup with Mushrooms, Bok Choy, and Shrimp

INGREDIENTS

• 2 teaspoons dark sesame oil
• Cooking spray
• 2 (3 1/2-ounce) packages shiitake mushrooms, trimmed and thinly sliced
• 3 tablespoons chopped peeled fresh ginger
• 3 cups fat-free, less-sodium chicken broth
• 3 cups water
• 1 tablespoon low-sodium soy sauce
• 3 cups coarsely chopped baby bok choy
• 2 tablespoons sliced green onions
• 2 tablespoons chopped fresh cilantro
• 1 pound peeled and deveined shrimp
• 1/4 cup fresh lime juice (about 3 limes)