Preheat oven to 350 F. Alternatively, set slow cooker on low; removing insert.
Pour enough vegetable juice to coat the bottom of a roaster pan or slow cooker insert. Set remaining juice aside.
Place beef evenly over juice. Sprinkle with steak spice.
Layer sliced onion over meat.
Peel and cut potatoes, carrots, and turnip/squash. Place around or on top of beef.
Pour vegetable juice over all. Be sure to coat all potatoes to prevent them from turning brown.
Rinse cans with a little water pouring this into the pan as well. Oven roasting will require ~1 and 1/2 cans of water; Slow cooker, a 1/2 can of water.
Bake, covered, for 3 hours or until meat is tender and vegetables are soft.
Or, cook in a slow cooker for ~8 hours, being careful not to lift the cover or cooking time will be longer.