Preheat oven to 275 degrees.
Pat the stew beef pieces dry with a paper towel. Season with salt and pepper.
In a large, oven safe pot with a lid, heat ghee over medium heat. Working in batches if necessary, brown the beef pieces, being careful not to overcrowd the pan. Add garlic and cook for one minute.
Stir in ½ cup of beef broth, scraping the pan to remove bits from the bottom. Bring to a simmer
and add thyme, rosemary and bay leaves. Stir in tomato paste and Worcestershire sauce.
Add vegetables, remaining beef broth, red wine and Guinness to the pot. Cover and transfer to
preheated oven. Cook in oven for 2 hours. Season with salt and pepper. Skim the fat from the
stew, if needed, before serving.