
Trim the roast or any visible fat, rinse, and pat dry with paper towels.
Generously salt and pepper the roast, rubbing the salt into as many cracks and crevasses as possible. Then season it with Cajun Creole seasoning. Set aside.
Heat a tablespoon of oil in a skillet over medium heat, place the roast in the skillet, and sear it on both sides until brown (3-4 minutes on each side).
Transfer the roast to the insert of a slow cooker. (I used a 6-quart slow cooker.)
Add the bay leaves, onions, garlic, celery, and thyme to the skillet. Stir until fragrant or 2-3 minutes.
Then, add tomato paste and beef broth, scraping all sides to deglaze the skillet. Bring to a boil, turn off the heat, and pour the mixture into your slow cooker.
Toss the carrots and potatoes into the slow cooker and salt to preference. (Remember, you can always add more.)
Cover and slow cook on high for about 3½-4 hours or low for 7-8 hours. You can start checking for doneness after 3½ hours on high or 7 hours on low until the roast is tender.
Remove your roast from the crock pot and let it rest for 10 minutes. Skim visible fat from the surface of the roasting liquid with a spoon. Discard the bay leaf and thyme stems. Strain out the vegetables, reserving the broth.
Melt the butter in a skillet or saucepan over medium-high heat.
Then gently whisk the flour in to make a roux, stirring for 2-3 minutes to remove the raw flour taste.
Gradually add a ¼ cup or more broth from the crockpot while whisking until the mixture thickens into a smooth sauce.
Then, add the remaining broth, adjusting the thickness to personal preference. Season with salt and pepper. (Remember, gravy thickens as it cools.)