Serves 5 to 6 • 4 Tbs. butter • 4 Tbs. flour • 1½ cups hot milk • 5 egg yolks • 1½ cups chopped cooked broccoli • ½ cup finely chopped or sliced walnuts • 3 Tbs. minced onion • 2 Tbs. grated Parmesan cheese • ½ tsp. salt • fresh-ground pepper to taste • 7 egg whites •...
