Philly Roast Pork Sandwich

Name: Philly Roast Pork Sandwich
Ingredients: One 3-pound (1.4kg) skinless, boneless pork butt (pork shoulder), preferably with fat cap (see notes); 3 medium cloves garlic, minced; 2 tablespoons (18g) Diamond Crystal kosher salt; for table salt use half as much by volume; 1 tablespoon minced fresh rosemary; 1 tablespoon minced fresh thyme; 1 teaspoon freshly ground black pepper; 1/2 teaspoon red pepper flakes; 2 tablespoons (30ml) extra-virgin olive oil; 1 medium yellow onion (8 ounces; 225g), halved and thinly sliced; 2 cups (473ml) pork stock, homemade chicken stock, or store bought low-sodium chicken broth (see notes); 3 tablespoons extra virgin olive oil; 1 1/4 pounds broccoli rabe; 1/4 tsp salt and freshly ground black pepper; 2 clove cloves garlic; 1 pinch red pepper flakes; 1 cup long hot peppers; 1 roll (1 oz) rolls; 18 slices provolone cheese