Prep the Salad
Chop lettuce, tomatoes, red onion, and pepperoncini. Toss into a large bowl.
Add Meats and Cheese
Chop deli meats into bite-size strips. Add to the bowl with shredded provolone if using.
Make the Dressing
Whisk mayo, vinegar, pepperoncini juice, oregano, garlic powder, salt, and pepper until smooth.
Toss It All Together
Pour dressing over the mixture. Toss thoroughly so every piece is lightly coated.
It should look creamy but not dripping.
Toast the Rolls
Slice hoagie rolls lengthwise. Add sliced provolone inside. Bake at 400°F for 5–7 minutes until warm and slightly crisp.
Assemble
Pile the grinder salad generously into the toasted rolls. Press lightly to settle.
Serve immediately.