Simmer the livers in stock until done, 8 to 10 minutes. Drain. Grind them with the eggs, using the medium blade of a food chopper. Or purée in a food processor, using a little of the liquid in which the livers were cooked.
Brown the onions lightly in the fat and blend all the ingredients to make a paste. Season with salt and pepper.
SERVING SUGGESTON: If desired, season further with a pinch of curry powder or a dash of cognac. Serve on buttered toast fingers or in a lettuce cup.