Instant Pot (Pressure Cooker) Method
- On the “High Sauté” setting, bring up to heat with the oil in the pot. Heavily salt and pepper every side of the beef roast and sear each side of the roast in the pot. Remove and set aside.
- Add the diced onion and cook until translucent.
- Add the canned tomato paste and cook for another 2-3 minutes.
- Deglaze the onions and tomato paste mixture with the beef stock, add the Mrs. Pinch, allspice, and mustard seeds and bring up to a simmer. Turn off “High Sauté” setting on Instant Pot.
- Add the beef roast back to the Instant Pot. Cook on “High Pressure” setting for 45 minutes. Allow to naturally release pressure for 25 minutes. You can remove the pot roast and slice it at this point, if you want. I like mine chunky and shreddy.
- After the pressure has been released, add the vegetables and pressure cook on high for 15 minutes. Natural release for 10 minutes, then release the rest of the pressure and remove the lid. Serve with a big slice of buttered bread if you’re like me, or if you want a healthier option, with a side salad. (I go for the bread option every time. What? There’s vegetables in there…) At this point, you can create a “gravy” for the Pot Roast, but that is depending on your own personal preference. I, personally, don’t (feels too much like a stew to me) but you can mix a slurry of 3 Tablespoons water and 2 Tablespoons corn starch and add it to the liquid of the pot roast, stirring until combined.
Oven Method
- Preheat oven to 275 degrees
- Salt and pepper all sides of the sides of the beef roast. On the stove top, in a large, oven safe pot or Dutch oven, heat up olive oil and sear all sides of the roast until browned. Remove and set aside.
- Add the diced onion and cook until translucent.
- Add the canned tomato paste and cook for another 2-3 minutes.
- Deglaze the onions and tomato paste mixture with the beef stock, add the Mrs. Pinch, allspice, and mustard seeds and bring up to a simmer. Remove from heat.
- Add the roast back into the pot along with the carrots, potatoes, and cabbage, then cover with an oven safe lid.
- Put pot on the middle rack in the preheated, 275-degree oven. Cook for 3 hours or until tender.