Chopped Chicken Liver a la Jennie Grossinger
Heat 2 tablespoons chicken fat in a large skillet over medium-low heat and cook onions, stirring often, until browned, about 20 minutes. Transfer onions to a food processor, leaving fat in the skillet. Cook chicken livers in hot skillet until firm, lighter in color, and no longer red in the centers, about 10 minutes.Advertisement
Place livers into food processor with onions and add 2 more tablespoons chicken fat, egg yolks, salt, and black pepper. Process until smooth, 1 to 2 minutes.
How to render chicken fat: Remove fat and the fatty skin from chicken. For each cup of fat to be rendered, you need 1/4 cup sliced onions and 1 slice apple. (I usually only use onions). Wash and drain the fat and cut into small pieces. Cook over low heat until the fat is almost melted. Add the onions and apple and cook until the onions brown. Cool and strain. The onions and pieces of skin (gribenes or cracklings) can be used for other things.