Season beef with 1 1/2 teaspoons salt and 1 teaspoon black pepper. Heat canola oil; add beef and cook until evenly browned, about 2-3 minutes per side; set aside.
Add onion, and cook, stirring frequently, until translucent, about 2-3 minutes. Stir in garlic and tomato paste until fragrant, about 1 minute.
Stir in red wine, scraping any browned bits from the bottom of the pot.
Stir in beef stock, Worcestershire, thyme, rosemary and bay leaves. Top with beef. Select manual setting; adjust pressure to high, and set time for 45 minutes. When finished cooking, quick-release pressure according to manufacturer’s directions.
Add potatoes and carrots; select manual setting; adjust pressure to high, and set time for 6 minutes. When finished cooking, naturally release pressure according to manufacturer’s directions, about 10-15 minutes.
Remove beef, potatoes and carrots from the Instant Pot®; shred beef, using two forks.
In a small bowl, whisk together cornstarch and 1/4 cup cold water; set aside.
Select high sauté setting. Bring to a boil; stir in cornstarch mixture and cook, stirring frequently, until slightly thickened, about 2-3 minutes. If the mixture is too thick, add more beef stock as needed until desired consistency is reached.
Serve beef, potatoes and carrots with juices immediately.
Notes
Look for marbling. When choosing a chuck roast, make sure it is well-marbled to ensure flavorful, tender pot roast. Look for visible fat streaks throughout the meat – the fat will melt throughout the cooking process, yielding rich, juicy, beefy goodness.
Sear the meat. Searing the chuck roast first will add all the extra, deeper flavors here, sealing all the juices inside.
Tomato paste adds so much flavor. Tomato paste adds body and richness in small amounts without adding too much liquid to the pot roast. Opt for tomato paste in a tube, using up only what you need at a time without having to open up a whole can.
Choose a wine you will drink. A dry red wine (cabernet sauvignon, pinot noir or merlot) is great here – it does not have to be anything fancy or overpriced. Just something you don’t mind sipping on since you will have an open bottle.
Fresh herbs are best. Although you can certainly substitute dried herbs, fresh herbs are ideal here, delivering the best kind of flavor.
Cook the vegetables after. Add the potatoes and carrots to the Instant Pot and cook on high pressure for 6 minutes after the beef has cooked through. Cooking the vegetables with the meat will lead to overcooked, mushy veggies.
Make a cornstarch slurry. Adding cornstarch directly into the Instant Pot can cause lumps. Always use a mixture of cornstarch and cold liquid (aka cornstarch slurry) to thicken the sauce, yielding a smoother, gravy-like consistency.
Serve with crusty bread. Serve with all the homemade crusty bread for dipping, sopping and dunking in the pot roast drippings!
Repurpose leftovers. The leftovers make for great nachos, sliders, enchiladas and breakfast hash for breakfast (or dinner!).