Cook the ravioli in plenty of boiling water following pack instructions. Meanwhile, in a large skillet, heat the butter and add the spring onion. When the onion is soft, add the zucchini and cook on high heat until soft and cooked. Add the milk and with a fork break the zucchini to form a creamy paste. When the ravioli are ready, drain and serve in bowls. Top with a tablespoon of sauce and sprinkle with fresh mint.