Brown the beef separately in a deep stock pot, then deglaze the bottom of the pot by adding the stock and stirring, scraping the bottom of the pot with a wooden spoon. Transfer the beef and broth to the slow cooker, and add in the seasonings and tomatoes. Cook on low for 6 hours or high for 4, adding the vegetables in the last hour (waiting to add the veggies ensures they don't turn into overcooked mush). Season & enjoy!