Select eighteen fine, fresh, medium-sized frogs; trim off the claws neatly, and put the frogs in a bowl. Marinade them with a table-spoonful of vinegar, the same of sweet oil, a pinch of salt and a pinch of pepper; mix well together in the bowl, then immerse them in frying batter. Plunge the frogs into very hot fat, one by one, and let fry for five minutes; then drain, and dress them on a hot dish with a folded napkin, decorating with a little parsley-greens. Serve with any desired sauce.