Preheat the oven to 400℉. Line a baking sheet with parchment paper and set aside.

In a medium bowl, mix together the mayonnaise, drained and chopped pepperoncini, pepperoncini juice, red wine vinegar, minced garlic, salt, and pepper. Set aside in the fridge until ready to use.

Pat the steak very dry with paper towels. Using a sharp knife, slice the steak very thinly against the grain. Cut longer pieces in half. Transfer to a medium bowl and add the arrowroot starch, salt, garlic powder, and pepper. Toss to combine.

Heat a large skillet over medium-high heat. Once hot, add the steak in a single layer. Sear until golden brown for 3 minutes, then flip and cook until the other side is golden brown, 1 to 2 more minutes. Transfer to a plate and set aside. Repeat with the remaining steak if necessary.

Add remaining oil (if needed) to the skillet. Add the onions and peppers and sauté until the onions are a deep golden brown and the peppers are soft, 5 to 7 minutes.

In a small bowl, mix together the Dijon, coconut aminos, and fish sauce.

Turn the heat down to medium. Add the cooked steak and its juices back to the pan with the onions and peppers. Pour in the coconut amino mixture and toss to combine. Allow to simmer until the sauce has thickened, 3 to 4 more minutes. Set aside.

Add the two halves of the rolls to the prepared sheet pan, tops side up. Coat with melted butter and flip over so that the butter side is facing down. Coat the surface of the rolls with the pepperoncini spread.

Layer on 4 slices of provolone to each half. Transfer to the oven and cook for 7 to 10 minutes until the bottom side of the rolls is golden and crisp and the cheese is bubbly and melted. Remove from the oven carefully.

Pile the steak and veggie mixture onto the bottom side of the rolls, pressing it into the cheese. Transfer the other half of the rolls over the meat, cheese side down and press gently. Using a sharp knife, cut the rolls into 12 pieces.

To serve, add a toothpick to each slider (with an extra pepperoncini on top) if desired!