Dredge roast in flour and season with steak seasoning. Return to skillet to heat with remaining oil; sear roast on both sides to brown.
Transfer roast to a slow cooker (crock pot) and top with the onions. Pour beef consomme over onions and cover; cook on medium-high setting for 6 hours.
After 6 hours, add potatoes and Margaret Holmes Diced Rutabagas; turn setting down to low and continue to cook for an additional hour.
Serve with a dollop of creamy horseradish, if desired.