1: In a bowl, combine minced onion, sweet relish, mayo, mustard, ketchup, sriracha, sugar, salt, pepper, smoked paprika, garlic powder, and onion powder to make the Big Mac sauce.
2: Prepare the burger patties and cook them on a grill or in a skillet.
3: Assemble the tacos with the Big Mac sauce and cooked burger patties.
