Lettuce Wraps (PF Chang's)

16- Iceberg lettuce leaves (1 head)
1 lb lean ground beef, or 4 boneless chicken breasts, diced
1 tbsp cooking oil
1 large onion, finely chopped
1-2 tbsp soy sauce
3 cloves fresh garlic, finely chopped
1/4 cup hoisin sauce (found in Asian food section)
1/2 tsp ground ginger
1 tbsp rice vinegar
1 8oz can water chestnuts, drained, finely chopped
4-5 green onions, chopped
2-3 tsp dark sesame oil
mushrooms (optional)

Brown meat in cooking oil, drain excess fat. Add onion, garlic, soy, hoisin, ginger, and vinegar. Stir until onions are softened (5 min). Stir in water chestnuts, green onions and sesame oil. Cook for another 5 min. Serve with lettuce leaves. Enjoy!