"Melt in Your Mouth" Pot Roast

Ingredients

• 1 chuck roast (mine was 3 pounds)
• Olive oil
• 1 pound carrots, peeled and cut into large chunks
• 2 pounds potatoes, peeled and cut into large chunks
• 1 onion, peeled and cut into large chunks
• 2 stalks celery, cut into large chunks (optional)
• 1 cup beef broth
• 1 tablespoons corn starch