Chicken Larb Salad

• 1 tbsp peanut oil
• 1 red onion, sliced
• 1 carrot, sliced
• 200 g green beans, ends removed
• 500 g chicken mince
• .5 cup coriander (cilantro) leaves
• 100 g bean sprouts
• 4 iceberg lettuce leaves
• 1 tbsp fish sauce
• 2 tbsp lime juice
• 1 tbsp maple syrup