1. Bring the broth to a boil in a large saucepan. Add the orzo and cook
until just tender - about ten minutes. Stir in the chopped spinach.
2. In the meantime, heat the tomatoes, red pepper flakes, and a splash
of extra virgin olive oil in a separate saucepan. Taste, and salt a bit
if needed.
3. Just before serving, slowly pour the egg whites into the soup,
stirring quickly with a whisk. The whites should take on a raggy
appearance. Taste and add more salt if needed. Serve the soup in
individual bowls, with each serving topped with a generous spoonful of
tomatoes, a drizzle of olive oil, and dusting of cheese.