I'll tell you what onion soup mix works really well on. London broil. Take an LB, press onion soup mix into the meat (I use two packages of Lipton's onion soup mix). Put it in a dutch oven with a bunch of little red potatoes and carrots, then add about 1 cup each of water and red wine. Throw that sucker in the oven at 325 for a few hours...and man...the stuff just falls apart and is it ever good.