Add mayonnaise, Parmesan, lemon juice, Dijon mustard, and Worcestershire sauce to a blender or food processor.
Add garlic, anchovy paste, black pepper, and salt. Blend until smooth.
With the blender running on low, slowly drizzle in olive oil to emulsify.
Add water 1 tablespoon at a time if a thinner consistency is desired.
Taste and adjust lemon, salt, or Parmesan as needed.
Transfer to a container and refrigerate at least 30 minutes before serving.
Notes
Freshly grated Parmesan gives the best texture and flavor.Do not skip anchovy; it adds authentic Caesar depth without tasting fishy.Dressing thickens after chilling—thin with a little water or lemon juice if needed.Store refrigerated up to 1 week.