Barbecue Eye Round on Mashed Turnips and Potatoes with Roasted Brussels Sprouts

Ingridients of Barbecue Eye Round on Mashed Turnips and Potatoes with Roasted Brussels Sprouts:

• 1  (3-lb.) eye round beef roast, fat trimmed
• 2  teaspoons ground cumin
• 2  tablespoons olive oil
• 2-1/2  pounds onions, cut into 1/3-inch-thick slices
• 2  celery ribs, chopped
• 2  garlic cloves, chopped
• 1  bottle (18 oz.) chipotle or regular barbecue sauce
• 2  pounds turnips, peeled, trimmed and cut into 1-inch cubes
• 3/4  pound Yukon Gold potatoes, peeled and cut into 1-1/2-inch cubes
• 1/4  cup fat-free milk
• 1  tablespoon horseradish sauce
• 1/4  cup chopped fresh flat-leaf parsley
• 1-1/4  pounds brussels sprouts, trimmed and cut crosswise into 1/8-inch thick slices