Start by measuring out your mayo, ketchup, sweet pickle relish, white vinegar, and sugar.
Add all ingredients to a small bowl.
Stir everything together until completely combined and smooth, ensuring the sugar fully dissolves.
Notes
Room temperature ingredients - For the smoothest blending, let your mayo come to room temperature before mixing.
Taste test - After mixing, give it a taste and adjust any ingredients as needed to match your preferred flavor profile.
Resting time - While you can use this sauce immediately, letting it rest in the refrigerator for at least 30 minutes allows the flavors to meld together for a more authentic taste.
Smooth texture option - If you prefer a smoother sauce without the relish chunks, you can pulse the ingredients in a food processor for a few seconds.