Heat the oil in a medium saucepan, then add the onion, ginger and garlic. Fry for 2 mins, then add the garam masala, give it 1 min more, then add the stock and carrots. Simmer for 10 mins, then add the chickpeas. Use a stick blender to whizz the soup a little. Stir in the beans and simmer for 3 mins. Pack into a flask or, if you’ve got a microwave at work, chill and heat up for lunch. Great with naan bread.