Chicken Fajita Lettuce Wraps with Tamari & Chili

Ingredients

• 1 pound skinless boneless chicken breast (sliced crosswise into 1/4-inch slices)
• 2 teaspoons cornstarch
• 1 tablespoon low-sodium tamari
• 1 teaspoon sherry
• 1 teaspoon chili powder
• 2 tablespoons chicken stock
• 1 tablespoon red wine vinegar
• 1 tablespoon sherry
• canola cooking spray
• 1 medium-sized red onion (thinly sliced)
• 2 cloves garlic (peeled and slightly smashed)
• 1 large red bell pepper (stemmed, cored, and cut into thin strips)
• 1/4 cup chicken stock
• 1/4 teaspoon Kosher salt
• 2 tablespoons roughly chopped fresh cilantro leaves
• 12 Boston lettuce leaves (or other large lettuce leaves)
• 1 ripe mango -- peeled and cubed
• cilantro leaves (whole)
• lime wedges