How to Make It
Preheat the oven to 275°. In a large microwave-safe bowl, cover the porcini with water. Microwave on high power for 2 minutes and let stand until softened, about 10 minutes. Drain, rinse and coarsely chop the mushrooms.
In a large, enameled cast-iron casserole, combine the beef, carrots, onions, garlic, tomatoes, cornichons, capers, herbs de Provence, bouquet garni and porcini. Add the wine and water. Season with salt and pepper and bring to a boil. Cover the casserole. Transfer it to the oven and braise until the meat is tender, about 2 hours.
Using a slotted spoon, transfer the meat and vegetables to a deep platter and cover with foil. Discard the bouquet garni. Skim as much fat off of the liquid as possible.
Set the casserole over high heat and boil the braising liquid until reduced to 5 cups, about 30 minutes. Return the meat and vegetables to the casserole. Season with salt and pepper and simmer until heated through. Serve the beef stew over buttered noodles.