Preheat oven to 300ºF. Liberally season the chuck roast on both sides and set aside.
Add oil to Dutch oven and heat over medium-high heat until oil is shimmering but not smoking. Add chuck roast to the oil. Cook to sear the meat, leaving it undisturbed until crispy golden brown (about 5 minutes). Then use tongs to flip the roast over and repeat by searing the other side.
Once both sides of the roast are browned, reduce the heat to medium and slide the roast to one side of the Dutch oven. Add onions and garlic to the other side of the pot, sautéing for 2 minutes, then stir in the tomato paste and sauté for an additional 2 minutes.
Add the beef broth to the pot and stir to deglaze the bottom of the pot. Place the beef roast over the onions and garlic. Nestle the potatoes and carrots on the sides of the roast. Place fresh herbs on top of beef roast, if using. Place the lid on the Dutch oven pot and transfer it to the preheated oven.
Bake chuck roast in oven at 300ºF for at least 3½ hours, checking the fluid level at 2 hours. Add more water if needed. The Dutch oven pot roast is done when the meat is tender and separates easily with a fork. Remove the roast and vegetables to a serving platter. Allow the meat to rest for 10 minutes before serving. To make gravy, see recipe notes.
Notes
Substitutes for Chuck Roast: Round roast and rump roast can be used with less predictable results. Use well-marbled roasts and be prepared to chop the cooked meat if it doesn’t shred easilyTo Make Gravy:
Make a slurry by mixing 3 teaspoons of cornstarch with 3 teaspoons of cold water in a small bowl, stirring until it is smooth.
After removing roast and vegetables from the pot, place the Dutch oven on the stove top over medium-high heat.
Add the cornstarch slurry to the leftover beef broth. Stir with a gravy whisk until smooth and thickened.
Storing Dutch oven chuck roast and vegetables:
Store leftover beef and vegetables in a sealed container in the fridge for up to 4 days.
To freeze, transfer to an airtight zip top bag or other freezer-safe containers, and freeze for up to 3 months.