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Chicken Liver Omelet Filling
1 cup minced cooked liver 1 teaspoon minced onion 1/2 cup Spanish sauce 1 teaspoon vinegar 1 tablespoon chopped mushrooms 1/2 teaspoon salt few grains cayenne
An omelet filling built on cooked chicken livers, from the invalid-cookery chapter where soft, quickly eaten protein dishes were the aim. The ingredient list is all the original gives, so the handling below matters more than usual.
- Cook the livers firstThe list calls for minced cooked liver, meaning livers already sauteed or poached through. Chicken livers should reach 165F and show no pink or bloody centre; a liver browned outside and raw within is the classic failure here.
- Spanish sauceIn books of this period Spanish sauce is generally a brown sauce (espagnole) let down with tomato, not a spicy tomato salsa. Half a cup of any well-reduced brown or tomato-brown sauce does the job; it is there to bind, so it should be thick enough to coat a spoon.
- The onion and mushroom want cookingA teaspoon of minced onion and a tablespoon of chopped mushroom eaten raw will taste raw. Sweat both in a little butter before combining, and drive off the mushroom liquid or the filling will weep into the egg.
- The vinegarOne teaspoon against a cup of liver reads harsh on paper but is the point of the dish, cutting the mineral richness of the offal. Add it at the end, off the heat, and taste before adding more.
- ConsistencyWarm the mixture gently and keep it just spoonable. A filling any looser will split the omelet when it is folded; any drier and it turns pasty.
- YieldAbout a cup and a half of filling, enough for two three-egg omelets, or four if served in small portions.
- Cayenne in invalid cookeryCayenne -- The few grains of cayenne are a seasoning rather than a garnish; small quantities of cayenne are routine in savoury dishes of this period. Leave it out if the dish is for someone with a sore mouth or throat.
Invalid cookery was a standing chapter in many household manuals from the mid-nineteenth century into the 1930s, written for people feeding convalescents at home before antibiotics, when recovery from fever or surgery meant weeks of careful feeding. Liver was prized in that context as a blood-building food, an idea that predates the isolation of vitamin B12 in the late 1940s but was not far wrong, and eggs were a common vehicle because they were soft and quickly digested. Folding a savoury filling into an omelet let a cook serve a meaningful amount of protein in a form that looked like a proper dish rather than a medicine. A sauce such as this one is a small economy of the professional kitchen carried into the home: a spoonful of yesterday's brown sauce turning scraps of cooked liver into a dish.