Make the grinder salad (10 minutes).
In a large bowl, mix mayonnaise, red wine vinegar, garlic powder, Italian seasoning, salt, and pepper. Stir in shredded iceberg lettuce, red onion, and parmesan cheese until well coated. Refrigerate while you prep the sandwiches.
Prep the bread (5 minutes).
Slice Italian bread lengthwise. Place provolone cheese slices evenly on both sides.
Toast until melty (5 minutes).
Place bread under the broiler (or in a hot oven) until the provolone melts and the edges of the bread turn golden brown.
Layer the meats (5 minutes).
Add ham, salami, capicola, roast beef, and turkey. Pile them high—it’s what makes a grinder a grinder!
Top with grinder salad (5 minutes).
Spoon the chilled grinder salad over the meats, letting some dressing drip into the bread.
Assemble and serve (2 minutes).
Close the sandwich, press lightly, slice, and enjoy immediately.