I pinned this recipe a few week ago.
An envelope of onion soup mix, an envelope of Italian dressing mix and an envelope of au jus mix. The recipe includes salsa but I just doubled the water. It was awesome!
Her website has a great printable version of the recipe. You can click the pin link above for Pinterest or the picture to go right to her website. She has a lot of great recipes.
I used a London broil and it was extremely tender. I can only imagine how it would have been if I had used the pot roast she pictured above. I would have taken a pic of ours but I turned around and it was gone!