Cover roast tightly with Oil and allow to stand for 10 minutes before carving. (During standng, internal temperature will rise to 150 degrees for medium-rare.) easure 1 cup of the poaching liquid from the roast pan. Dissolve ornstarch in 1 tablespoon of this liquid in a small Saucepan. Add emainder of cup, along with mustard and Parsley. Cook and stir over edium heat until Sauce is clear and slightly thickened, 3 to 5 inutes. Remove string from roast and carve into thin slices. Serve ith mustard Sauce. Note: Remainder of poaching liquid from meat can be used to make rench Onion Soup. ----