In a bowl, mix together the basic mayo, ketchup or tomato paste, pickle relish, minced onion, apple cider vinegar, and kosher salt. Store in a container and refrigerate while preparing the rest of the dish.

Preheat skillet over medium-high heat with 1 tbsp avocado oil.

While the skillet is heating up, divide the ground beef into 6 balls.

Season the balls with kosher salt and black, place in skillet and then flatten with the back of your flipper.

Cook for 3-4 minutes per side or to your desired doneness. Once done, place on a paper towel lined plate.

Assemble the sliders: tostones, Big Mac sauce, diced onions, shredded lettuce, burger patty, pickles, tostones, Big Mac sauce, diced onions, shredded lettuce, burger patty, pickles, and tostones.

Repeat until you get three sliders.