the apple you are using is the dessert variety, just 2 tablespoons if it is a cooking apple. Mix everything together well using your hands -a little messy, but spoons are not as effective -then pile the mixture into a buttered casserole. Lay a sheet of thickly buttered greaseproof paper directly on top of the vegetables and cover the casserole with a well fitting lid to prevent drying out. Cook at 300 F (150 C) gas mark 2 for about 2-1/2 hours until the vegetables are beautifully tender, if possible stir the mixture once or twice as it cooks. Remove the greaseproof paper and check seasoning immediately before serving. Serve the vegetable mixture just as it is, or top at the last minute with 1/4 pint cold creamy yoghurt or soured cream into which you have stirred a few bruised and lightly crushed caraway seeds. Or hand round the bowl of flavoured cream separately, so that those who want it can help themselves.