Soup alla Maria Pia

Ingredients: White stock, eggs, butter, peas, white beans, carrot, onion, leeks, celery, cream croutons.

Soak one pound of white beans for twelve hours, then put them into a stock pot with a little salt, butter, and water, add a carrot, an onion, two leeks, and a stick of celery, and simmer until the vegetables are well cooked; then take out all the fresh vegetables, drain the beans and pass them through a sieve, but first dilute them with good stock. Put this puree into a stock pot with good white stock, and when it has boiled keep it hot in a bain-marie until you are about to serve; then mix the yolk of three eggs in a cup of cream, and add this to the soup. Pour the soup into a warm tureen, add some boiled green peas, and serve with fried croutons handed separately.