Beat with an electric hand mixer on medium-high speed for at least 30 seconds, until smooth and well combined.
Transfer to a jar or airtight container.
Refrigerate for at least 12 hours before serving so the dressing thickens and the flavors meld.
Notes
Anchovy paste gives the dressing its restaurant-style savory depth without making it taste fishy. Beat the dressing long enough to fully emulsify it. Refrigerate for at least 12 hours because the garlic mellows and the dressing thickens as it rests. Do not use Miracle Whip in place of mayonnaise.