Slow Cooker Mirepoix Roast Beef

beef chuck roast (sear in olive oil on each side)

Salt & pepper

large container Mirepoix (14 oz. mixture of onion, carrot, celery, from Trader Joe’s, or about 1 cup each, diced)

red wine

beef stock (we use 2 Tbsp. Better Than Bouillon Roasted Beef Base + 1 cup water)