Halve and core the kidneys. Soak them in acidulated water for 1 hour then drain and dry. Bone the pork, reserve the rind and cut the flesh (there should be at least 1 lb.) into large cubes. Grate the zest of all 3 oranges and squeeze the juice from 2. Measure the juice and add enough yeast extract dissolved in hot water to make 8 fl. oz. of liquid in total.
Seal the pork briskly in a little hot fat and transfer to a casserole. Slice the kidneys thickly, dust with flour, brown in the hot fat and add to the casserole. Tie together 3 sprigs of rosemary, 6 bruised parsley stalks and a bay leaf, and bury the bouquet among the meats. Roughly chop the onion and fry it briefly. Sprinkle on 1-½ tablespoons flour and pour on the liquid. Bring to the boil, stirring, and add to the casserole. Add plenty of salt and pepper, the crushed garlic and orange zest. Cut the celery into large chunks and add it to the casserole - do not stir it in. Lay the pork rind, fat side down, on top of the celery, and put a sheet of greaseproof paper over that. Cover with the lid and cook at 325 F (160 C) gas mark 3 for 1-½ hours, then at 300 F (150 C) gas mark 2 for a further 45 minutes.
Remove and discard the paper, rind and bouquet of herbs. Stir the casserole to mix the ingredients and add the flesh of the reserved orange, cut into V-shaped segments and ruthlessly stripped of all membrane. Cover with fresh greaseproof paper and the lid; cool quickly and chill overnight.
Remove surface fat and reheat the casserole gently but thoroughly for serving. Check seasoning and garnish with fresh chopped parsley.
Your Pork with Celery & Orange is ready. Happy cooking!
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