Boneless chuck roast makes the BEST "sour beef", since it literally "melts" in the gravy - and only needs to marinate overnight. My mom used to make REAL potato dumplings from cooked, riced potatoes, but Panni mix works well without the uncertainty of disintegration. I have found that commercial gingersnaps aren't what they used to be, carry very little ginger flavor, and does not thicken for gravy. A few years ago, I BEGGED Zaaries for a gingerbread cookie recipe, was given "Recipe#111307", Good Old Gingersnaps, which I have used since, but doubling the amount of ginger. Leftovers are great on noodles or bread.
Cooking time includes marinating overnight.