Trim beef of some excess fat, but don't trim it fully. Use paper towels to dry beef thoroughly. Slice roast into 8 even pieces. Generously season all sides of beef with kosher salt and freshly ground black pepper, pressing down to adhere seasoning to meat.
In a large Dutch oven or large pot (not nonstick,) heat up 2 TB olive oil over medium-high heat. Once oil is hot, brown half of the beef pieces on all sides. Repeat with other 2 TB olive oil and remaining pieces of beef. Transfer beef to slow cooker and set aside.
In the original Dutch oven or large pot, add the carrots, celery, onion, and garlic over medium high heat. Stir and cook for 5 minutes. Transfer mixture to the slow cooker.
Pour wine into the Dutch oven or large pot and deglaze over medium heat, scraping any leftover bits from the bottom of pot. Reduce to simmer, and simmer about 4 minutes or until liquid is almost reduced by half. Add wine mixture to the slow cooker. Add bay leaves.
Fill slow cooker with broth and cook 12 hours on low or 6 hours on high. Transfer meat and veggies to a serving platter and keep warm; skim fat off the liquid in slow cooker.
Make gravy: In a saucepan, stir tomato paste for 1 minute over medium heat. Add the liquid from slow cooker and whisk until combined. Add kosher salt and pepper to taste. Add dissolved corn starch mixture to the liquid; bring to a boil and stir until thickened to a gravy consistency. Pour gravy over the pot roast with veggies. Garnish with parsley if desired. Serve with rice, buttered noodles, crusty bread, or potatoes.
Notes
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