Add the 3 cups of mayonnaise to your bowl first. Make sure to scrape out every bit from the jar with a rubber spatula.
Add the 3 tablespoons of sugar right on top of the mayonnaise. The sugar will help balance out the tangy flavors that come next.
Pour in the 1/4 cup of apple cider vinegar slowly. This is where the magic happens. The vinegar gives this sauce its signature tang that makes it different from regular mayo-based sauces.
Add the 2 tablespoons of fresh lemon juice. Squeeze it fresh from real lemons for the best taste. The lemon brightens everything up and adds that extra zing.
Sprinkle in 1 teaspoon of salt and 1/2 teaspoon of black pepper. These seasonings bring out all the other flavors and make everything taste more complete.
Add 1/4 teaspoon of cayenne pepper. This gives the sauce its special kick without making it too hot. You can always add more later if you want extra heat.
Take your wire whisk and start mixing everything together. Whisk gently but thoroughly. Don't use a blender or food processor because that will make the sauce too thin and runny. You want to keep that thick, creamy texture.
Keep whisking until everything is completely combined and smooth. The sauce should be creamy white with tiny flecks of the spices mixed throughout.
Transfer the sauce to a clean jar or container with a tight lid. Serve the sauce chilled as a dipping sauce, brush it on grilled meats, or use it however you like.