Tasty Bean Stew with Couscous - Ainsley Harriott

Ingredients

• 1 tbsp olive oil
• 1 small onion, finely chopped
• 1 stick of celery, finely chopped
• 2 cloves of garlic, finely chopped or grated
• 1 tbsp tomato purée
• 1 x can chopped tomatoes
• Pinch chilli flakes
• 1 x 400g can of butter beans
• Salt and pepper
• 1 tsp brown sugar or honey
• 100g frozen green beans
• 1 packet of Ainsley Harriott Couscous
• Sprig fresh rosemary or ½ tsp mixed dried herbs
• To serve, drizzle of pesto (optional)