Preheat the oven to 350F. Cut 2lb chuck flat into 4 equal portions, trimming excess fat. Season each portion with salt and pepper.
In a Dutch oven, or cast-iron pot, heat avocado oil over medium high heat. Sear short ribs on each side until you begin to see color in the beef and on the pan.
Remove the short ribs onto a plate.
Add balsamic vinegar to deglaze the pan.
Add onions and garlic cloves. Cook over medium heat, stirring until the onions are translucent.
Add tomato paste to the pot and continue cooking for one minute.
Add flour and stir thoroughly.
Add wine and cook until reduced to half.
Add the broth and the herbs to the pot and stir to combine. Sauce should nicely coat a spoon but not be overly thick. Add more broth if it appears too thick.
Return the short ribs to the pot. Cover pot with lid and cook in the oven for 2 hours. If the beef is still firm after two hours, allow more cooking time.
Remove the pot from the oven and add in carrots and potatoes. Return to the oven for another hour.