On a plate, evenly season roast with salt and pepper. Be sure to get all sides of the roast and massage seasonings into the meat. Allow to sit and marinate for 20 minutes while you prep the other ingredients.
In a bowl, mix together tomato paste and water, then set aside.
In a 6-quart slow cooker, add carrot, celery, onion, garlic, thyme, rosemary, and potatoes. Mix.
Drain any liquid from the marinating roast into the slow cooker, pouring evenly over the vegetables. Then pour in tomato-water mixture evenly on top as well.
Dust roast with 1 cup of flour, making sure to get all sides, then tap off any excess and place into the slow cooker on top of vegetables.
Cook on low for 5 hours.
Remove pot from base and partially open lid. Allow roast to rest like this for 30 minutes before serving. This a crucial step for keeping the roast moist, do not skip it.
Call your family and tell them it’s dinner time.