Yes you can make this in the oven! Make sure to use a large, heavy based pot on the stove and after searing the beef and cooking the onion, add in the tomato paste Worcestershire sauce and the potatoes and carrots. Cook for a few more minutes, scraping the bottom of the pan. Add back in the beef, thyme and stock and mix to combine. Place the lid on and add the pot to a low oven for 3-4 hours, checking occasionally to stir. If the stew is getting too thick, add a little water so it doesn’t dry out.