Barbecued Chinese Chicken Lettuce Wraps

INGREDIENTS

• 2 tablespoons light colored oil, such as vegetable oil or peanut oil
• 3 scallions, chopped
• 1 small tin, 6 to 8 ounces, sliced water chestnuts, drained and chopped
• 1 orange, zested
• 3 tablespoons hoisin, Chinese barbecue sauce, available on Asian foods aisle of market
• 1 inch ginger root, finely chopped or grated, optional
• Coarse salt and coarse black pepper
• 3 cloves garlic, chopped
• Wedges of navel orange -- platter garnish
• 2 cups, 4 handfuls, fresh shiitake mushrooms
• 1 1/3 to 1 1/2 pounds thin cut chicken breast or chicken tenders
• 1/2 large head iceberg lettuce, core removed, head quartered
• 1/2 red bell pepper, diced small