Heat cast iron skillet over medium heat and add oil. when hot add the chuck roast(in batches as to notcrowd the skillet) Sear the meat on all sides until browned.
Transfer meat to the slow cooker.
Add the carrots, bell peppers, onion, garlic, adobo, salt, cumin, cayenne pepper, oregano, vinegar,tomatoes and water to the slow cooker.
Set to low for 7-8 hours. It will be done when the meat is tender and shreds apart easily with fork.
Taste and season with more salt and pepper if you like. Add the cilantro to the slow cooker and stir until it is well incorporated.
Serve ropa vieja over rice.
Refrigerate any leftovers when cool.