Loosely based on Cass Abraham's Tomato Bredie, but designed for a proper potjie pot. The Potjie pot is usually placed over a fire or barbecue. (though a large saucepan on the hob will do, honest!). This is a traditional South African stew, usually made with mutton. I adapted it so that you can get the ingredients easily in Britain's lamb-obsessed supermarkets. The longer you leave it cooking, the better it gets.