Preheat oven to 350°F.
Slice the entire slab of Hawaiian rolls in half horizontally and place the bottom half in a baking dish.
Layer the salami, turkey, provolone, and pepperoni evenly over the rolls. Place the top buns back on.
In a small bowl, mix together the melted butter, garlic powder, parsley, and red pepper flakes. Brush generously over the tops of the rolls.
Cover with foil and bake for 20 minutes, until the cheese is melted and everything is heated through.
While the sliders bake, make the grinder topping: In a large bowl, combine the mayonnaise, red wine vinegar, Italian seasoning, splash of banana pepper juice, and parmesan. Whisk together, taste and adjust.
Into the dressing add in the romaine, banana peppers, and red onion. Toss until evenly coated.
Remove the sliders from the oven and carefully lift off the top buns. Spoon the grinder topping evenly over the meat and cheese.
Replace the top buns, slice into sliders, and serve immediately.
