Paella con costra is an unusual paella with an egg crust that is finished in the oven. The crust seals in all the aromas until it is broken open at the table.
Preheat the oven to 190°C/375°F/Gas 5. Heat the oil in a flameproof casserole and fry the sausage until browned. Add the tomatoes and fry until reduced. Stir in the pork and chicken or rabbit pieces and