Step 1

Combine broth, water, pasta, chickpeas, scallion whites and nutmeg in a Dutch oven; cover and bring to a boil over high heat. Uncover and boil for half as long as directed by the pasta package, 3 to 5 minutes.

Step 2

Stir in arugula and cook until wilted, about 1 minute. Reduce heat to low. While stirring the soup constantly, slowly add eggs; cook for 2 minutes. (The cooked egg will look like feathery strands.) Season with pepper and stir in the scallion greens and lemon juice. Ladle into 6 bowls and top with Parmesan.