Pod the beans, asking the toddlers to help you.
Bring a small pan of water to the boil, carefully tip the beans into the pan and boil for 3 mins. Drain and plunge the beans straight into a bowl of cold water. Now sit down and enjoy peeling them – they should pop out of their skins.
Put the beans into a blender (or a bowl and use a handheld blender) with the spring onion, crème fraîche and mint, and purée until smooth. Add a little more crème fraîche if you want it to be slightly more creamy.