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- 24 to 36 thin slices freshly cooked boiled beef
- 1 hard-cooked egg, put through a sieve
- 1 egg yolk
- Arrange the meat neatly with overlapping slices in a symmetrical pattern.
- To prepare the sauce, put the sieved egg, egg yolk, mustard, vinegar, onion, shallots, parsley, and tarragon in a mixing bowl.
- Using a wire whisk, stir to blend, then gradually add the oil, stirring vigorously and continuously. It should thicken like mayonnaise.
- Season th