This Roast I tried as a trial and error recipe. Well it turned out so juicy and wonderfully tender. This was so moist we couldn't believe it. This roast only fed 4 of us because we couldn't stop eating it. I borrowed a picture from the web because everybite disappear before I got a picture.
Blend mustard with water to make a paste. Cover and let stand for 5 minutes. Place tin foil in shallow baking pan. Place onions, Garlic, and roast on foil. Stir soy sauce into mustard mixture, blending till smooth. Pour mixture evenly over roast. Fold and seal foil to cover roast. Bake at 325 degrees for 3 hours.