Gather all your ingredients and ensure they're at room temperature for the best blending results.
Mince 4 of the garlic cloves very finely, or press them through a garlic press.
In a food processor or blender, combine the minced garlic, mayonnaise, and anchovy fillets.
Add the Parmesan cheese, Dijon mustard, lemon juice, Worcestershire sauce, black pepper, and salt (if using).
Pulse the mixture until smooth and well combined, scraping down the sides as needed.
If the dressing seems too thick, add olive oil 1 teaspoon at a time until you reach your desired consistency.
Take the remaining 2 garlic cloves and cut them in half. Use these to rub the inside of your serving bowl for extra flavor.
Transfer the finished dressing to an airtight container and refrigerate for at least 15 minutes before using to allow the flavors to meld.