Toss the beef in the flour until fully coated
Add olive oil to a large soup pot, enough to coat the bottom
Brown the beef on all sides in the pot at medium high. Do it in 2 batches so things aren't crowded. You want that deep brown crust, about 5 mins per batch. removing to a separate bowl with a slotted spoon
Turn heat to medium, add the onions and celery to the pot, stir to coat in meat juices, add salt and saute til fragrant, 3-5 minutes
Add the tomato paste, garlic and herbs and continue to saute another 3 minutes
Add the beer, mustard, Worcestershire, and beef broth and scrape up the fond, bring to a strong simmer at medium high heat
Return the beef to the pot, stirring to combine. Turn the heat to low, cover almost fully and simmer for an hour, stirring occasionally