Separate the yolks from the whites, placing the whites in a large bowl and the yolks in a small bowl. Heat a drizzle of olive oil in a non-stick pan, lightly fry the spring onion, then add the green beans and sauté for a few minutes. Add half a glass of water and cook for 5 minutes. When cooked, add the yolks and stir quickly, seasoning with salt and pepper. Whisk the egg whites, adding a few drops of lemon juice, salt and pepper.