Asian Lettuce Wraps

INGREDIENTS

• 16 Boston Bibb or butter lettuce leaves
• 1 pound lean ground beef
• 1 tablespoon cooking oil
• 1 large onion, chopped
• 2 cloves fresh garlic, minced
• 1 tablespoon soy sauce
• 1/4 cup hoisin sauce
• 2 teaspoons minced pickled ginger
• 1 tablespoon rice wine vinegar
• Asian chile pepper sauce (optional)
• 1 (8 ounce) can water chestnuts, drained and finely chopped
• 1 bunch green onions, chopped
• 2 teaspoons Asian (dark) sesame oil