Melt the butter in a stewpan, and put in the onions to stew gently for 3 or 4 minutes; then add the celery, spinach, lettuces, and parsley, cut small. Stir the ingredients well for 10 minutes. Now put in the water, bread, seasoning, and mace. Boil gently for 1 1/2 hour, and, at the moment of serving, beat in the yolks of the eggs and the vinegar, but do not let it boil, or the eggs will curdle.
Time: 2 hours.
Seasonable all the year.
Sufficient for 8 persons.
The Book of Household Management (1861).