In your Dutch oven, add chopped veal, leeks, carrots, onions, mixed herbs and salted water. Cook on low, skimming off any foam from the surface if necessary. Cook mushrooms in a separate skillet, add lemon juice and set aside. In a bowl, combine egg yolks with the zest and juice of 1 lemon, and add heavy cream. Strain the cooking juices into the sauce and heat on low. Serve the veal immediately with the mushrooms and sauce with white rice on the side.