Best London Broil Recipe ever! 1 london broil, 1 pkg ranch salad dressing mix, 1pkg italian salad dressing mix, 1 pkg brown gravy mix, 1-1/2 cups water. Mix all the dry ingredients with the 1-1/2 cups water. Place roast in crock-pot. Pour the mixture over roast. Cook on low for 6 hrs (suggested) or 4 hours on high. Enjoy!