Mix the peanut butter with 1 cupful of milk. Heat 2 cupfuls of milk in a double boiler. Cook the celery in the water until the vegetable is tender. Add the grated potato, cook, and stir until the mixture is thickened. Then add it to the hot milk. Also add the peanut butter mixture and seasoning. Heat until it is hot. Beat with a Dover egg beater. Serve hot.
Dried celery leaves may be used instead of fresh celery.