Start by preparing the dressing. In a medium bowl, whisk together the Worcestershire sauce, water, apple cider vinegar, dry sherry, apple sauce, seasoning salt, sugar, paprika, and garlic powder until combined.
Slowly pour in the vegetable oil while whisking constantly until all of the ingredients are blended into a smooth dressing.
Wash and dry the romaine lettuce, iceberg lettuce, spinach, beets, and hard-boiled egg before adding them to a large bowl.
Add the croutons and grape tomatoes to the bowl then pour over the prepared dressing.
Gently toss all of the ingredients together until everything is evenly coated. Serve the salad immediately or store it in an airtight container for up to 2 days.