Cut cold veal in half-inch slices, season with two tablespoons of vinegar, pinch of salt and pepper. Make a dressing using the yolks of three hard-boiled eggs, mashed smooth, add gradually two tablespoons of melted cold chicken or turkey grease, stir until smooth and thick, then add one teaspoon of prepared mustard, large pinch of salt and pepper, one teaspoon of sugar, one teaspoon each of mustard and celery seed, and five tablespoons of white vinegar. Mix the dressing well with the veal, and serve with or without lettuce leaves.