Adapted from How Easy is That
Bring a medium pot of water to boil. Fill a large bowl with water and ice cubes. Place green beans in boiling water and cook for 1 minute, until bright green. Drain and quickly pour beans into ice water (this will stop the cooking process).
In the now empty pot, add prosciutto and cook over medium heat, until golden brown on the edges and crispy. Drain beans. Add olive oil, lemon juice, onion, cheese and prosciutto to green beans. Toss well. Season to taste with sea salt and black pepper. Serve.
Find it online: https://deliciouslyorganic.net/green-beans-prosciutto/