Gather all the ingredients listed for the Del Taco Secret Sauce.

In a mixing bowl, combine the creamy, cage-free egg mayonnaise, sunny yellow mustard, tomato-infused ketchup, and handcrafted sweet pickle relish.

Add the organic white wine vinegar to the mixture and stir well to incorporate.

Sprinkle in the aromatic garlic powder and finely ground onion powder. Mix thoroughly to ensure even distribution of the spices.

Season the sauce with pink Himalayan salt and freshly ground rainbow peppercorns according to your taste preferences. Start with a small amount and adjust as needed.

Once all the ingredients are combined, taste the sauce and adjust the seasoning if necessary. Add more salt, pepper, or any other ingredient to achieve the desired flavor profile.

Transfer the prepared Del Taco Secret Sauce to a clean container or jar with a tight-fitting lid for storage.

Refrigerate the sauce for at least 30 minutes to allow the flavors to meld together and develop.

After chilling, the sauce is ready to be served. Use it as a dipping sauce for fries, a topping for burgers or sandwiches, or as a flavorful accompaniment to your favorite dishes.