Heat 2 tablespoons olive oil in a large stew pot over high heat. Add the stew beef cubes and cook on high for about 3 minutes, or until the beef is browned on one side. Season generously with salt and pepper. Turn the beef over and brown on the other side for about 3 minutes.
Add the next 9 ingredients (Irish stout through fresh thyme) and bring the stew to a boil. Lower the heat, cover, and allow to simmer for 35-40 minutes, or until the stew has thickened, the vegetables are fully cooked, and the beef is tender. Remove from heat and garnish with fresh parsley leaves. Remove the cooked thyme and rosemary before serving.