1 lb. cod, or other white fish
2 tablespoonfuls Crisco
1 quart white stock, or half milk and half water
1 small carrot
1 small onion
1 stalk celery
3 parsley sprigs
1 blade mace
2 egg yolks
1/2 cupful cream
1 lemon
2 tablespoonfuls flour
1 teaspoonful chopped parsley