Pot Roast in Rich Gravy

Name: Pot Roast in Rich Gravy
Ingredients: 1/4 cup matzoh cake meal; 4 tablespoons vegetable or olive oil, divided; 1 (4 1/2-to 5-pound) beef chuck roast, tied; 1 large onion (about 1 pound), coarsely chopped (2 cups); 2 large carrots (about 1/2 pound), coarsely chopped; 2 medium parsnips (about 1/2 pound), coarsely chopped; 2 cups full-bodied red wine; 4 cups chicken broth; 1 (28-ounce) can diced tomatoes in juice; 5 full sprigs fresh thyme; 2 bay leaves; 1 (3-inch long) cinnamon stick; Fresh horseradish root, peeled and finely grated for serving (optional); a 6- to 7-quart-wide heavy pot with lid