In a medium-sized mixing bowl, gather your mayonnaise and sour cream.

Use a whisk or a spoon to blend them together until smooth.

Add the sweet chili sauce to your mayo and sour cream mixture.

Stir it well to ensure a consistent base.

Introduce the prepared horseradish into the mix.

Use a gentle folding motion to incorporate it thoroughly.

Sprinkle cayenne pepper over the mixture.

Mix again to make sure every spice is evenly distributed.

Allow the sauce to chill in the refrigerator for at least two hours.

This helps the flavors meld together for a richer taste.

Taste your sauce after chilling.

Adjust ingredients as needed, adding more horseradish or cayenne for extra kick.