Combine the creamy base – In a medium-sized mixing bowl, add ½ cup of mayonnaise and ½ cup of sour cream. Stir them together until smooth and well blended.
Add a tangy kick – Pour in ⅛ cup of ketchup (or chili sauce if you want extra heat). Mix thoroughly.
Spice it up – Sprinkle in ¼ teaspoon of cayenne pepper. Adjust the amount later if you prefer a spicier dip.
Bring in the bold flavor – Add 1 tablespoon of prepared horseradish. Stir well to distribute evenly.
Mix until smooth – Whisk or stir the sauce until all ingredients are fully incorporated.
Serve and enjoy – Transfer the sauce to a serving bowl and pair it with hot fries, onion blossoms, chicken tenders, seafood, or as a sandwich spread. Refrigerate for 30 minutes before serving.
