Pommes Rot/Weiß also called Pommes Bahnschranke refer to potato fries or pommes frittes with ketchup and mayonnaise. Rot (red) represents the Catsup and Weiß or Weiss represents the Mayonnaise Pommes Ro/Weß literally means potato chips red/white or potato chips "level crossing barrier" (Bahnschranke) because of the way the barrier is painted red and white