How to Make It
Preheat the oven to 350°. In a large enameled cast-iron casserole, heat the oil. Season the chicken with salt and pepper. Add half of the pieces to the casserole and cook over moderately high heat until browned all over, 8 minutes. Transfer to a plate. Brown the remaining chicken.
Pour off all but 2 tablespoons of the oil from the casserole. Add the onion, poblano and bell pepper. Cook over moderate heat, stirring, until softened, 8 to 10 minutes. Stir in the tomatoes and cook until broken down, about 8 minutes. Add the pimentón and cook for 1 minute. Add the wine, vinegar, thyme and bay leaves and simmer until the liquid is reduced by half, 2 minutes. Nestle the chicken in the sauce, cover and braise in the oven until cooked through, about 1 1/4 hours; discard the thyme and bay leaves.
In a saucepan, combine the wine, oil, saffron and 1 cup of water and bring to a boil. In a large heatproof bowl, combine the couscous, currants, onion and salt. Pour the hot wine mixture over, cover and let stand until the couscous is tender and the liquid is absorbed, 30 minutes. Fluff the couscous and serve with the chicken.