This chuck roast recipe is perfect for those who love fresh and herbaceous flavors. Using a food processor, blend together parsley, cilantro, garlic, red wine vinegar, and olive oil to create a chimichurri sauce. Rub the sauce all over the chuck roast and let it marinate for at least an hour. Sear the roast in a hot skillet until browned on all sides. Transfer the roast to a slow cooker and add beef broth, onions, and bell peppers. Cook on low for 8 hours. The result is a tender and flavorful roast with a bright and fresh chimichurri sauce.