1/2 lb Potatoes 1 pt Cold water 1 md Leek 1 Garlic clove 1/2 md Onion 1/4 tb Oil 1/2 ts Yeast extract 1/2 ts Ground black pepper 1 Bay leaf 1/4 ts Caraway seed 1 Celery stalk Peel and cube the potatoes Place in a large bowl with the cold water Leave to one side Top and tail the leeks, then slice into chunks Wash in a bowl of cold water, drain and rinse Leave to drain in a colander Finely chop the onion Saute the garlic and onions in a large deep saucepan in the oil until tender. Add the potatoes and the water they have been sitting in. Increase the heat bringing the liquid to a rolling boil Add the yeast extract Stir well, reduce heat and add the leeks, black pepper, bay leaves and caraway seed. Stir well for 1-2 minutes Add the celery to the soup and simmer for a further 15 minutes. Serve hot.