BBC Food - Recipes - Chicken and butter bean casserole with basmati rice

Ingredients

• drizzle of olive oil
• 4 red onions , finely chopped
• 1 garlic clove, crushed
• 2 celery sticks, finely sliced
• 1 red pepper , seeded, finely sliced
• 2 leeks , finely sliced
• 6 portabellini mushrooms (or any large flat mushrooms )
• 1 3/4 litres/3 pints chicken stock
• 2 tbsp soy sauce
• 1 x tin 400g/14oz canned chopped tomatoes
• 2 carrots , finely chopped
• 1 x tin 400g/14oz butter beans , rinsed and drained
• 10 chicken thighs , on the bone, skin removed
• water
• 285g/10oz basmati rice