1. In an enameled cast-iron casserole, melt 2 tablespoons of the butter. Season the beef with salt and pepper and add one-third of it to the casserole. Cook over moderate heat until lightly browned, 3 minutes per side. Transfer to a bowl. Repeat with 2 more batches of meat, using the remaining 2 tablespoons of butter.’
2. Add the onions to the casserole, cover an cook over low heat, stirring, until browned, 8 minutes. Stir in the flour until the onions are well-coated, then slowly add the beer. Return the meat to the casserole along with any accumulated juices. Add the thyme and bay leaves, cover and simmer over low heat, stirring, until the beef is tender, 2 hours.
3. Uncover and transfer the meat to a bowl. Simmer the sauce over moderate heat until thickened slightly. Discard the bay leaves. Return the meat to the casserole and season with salt and pepper. Sprinkle with parsley and serve with the boiled carrots and potatoes.
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