Heart oil in lg skillet and brown beef on all sides. Coat slow cooker w cooking spray. Add bbq sauce and scallions. Nestle beef into mixture. Cover and cook until beef is tender, 6 - 8 hours on low or 4 - 5 hours on high.

Stir together sour cream, mayo, horseradish, vinegar, honey, and pepper sauce in lg bowl and add coleslaw mix and toss.