Portuguese Spinach Soup
["2 lb. spinach, washed", "1 small onion, chopped fine", "2 Tbsp. butter", "4 c. chicken stock", "salt and pepper to taste", "1/8 tsp. nutmeg", "1 egg, beaten", "grated Parmigiano Reggiano"]
["Cook spinach in water already on washed leaves (briefly).", "Chop fine.", "Cook onion in butter.", "Add the spinach, stock and seasoning.", "Simmer 10 minutes.", "Stir in egg (well beaten).", "Cook until lightly thickened, without boiling.", "Sprinkle with Parmigiano Reggiano.", "Serves 4 to 6."]
["onion", "butter", "chicken stock", "salt", "nutmeg", "egg"]