Beef and tomato stew

Ingredients

• 1 tbsp olive oil
• 1 large onion, finely chopped
• 3 medium carrots, sliced
• 3 celery stalks, sliced
• 800g beef steak, fat trimmed and cut into pieces
• 400g tin chopped tomatoes, drained
• 235ml chicken stock
• 3 garlic cloves, peeled and crushed
• Salt and ground pepper
• 300g basmati rice
• 6 tbsp low fat Greek style yogurt
• Handful fresh parsley, finely chopped