Grilled Giardiniera Stuffed Steak Sandwich

Ingredients

• 1 teaspoon celery salt
• 1 teaspoon ground coriander
• 1 teaspoon garlic powder
• 1 teaspoon Italian seasoning
• 1 teaspoon onion powder
• 1 teaspoon smoked paprika
• Kosher salt and freshly ground black pepper
• One 1 1/2-pound flank steak
• One 16-ounce jar hot giardiniera in oil
• One 12-ounce jar sliced sweet peppers
• 20 thin slices provolone (about 7 1/2 ounces)
• 1 shallot, finely chopped
• 1 1/2 cups beef broth or stock
• 2 tablespoons unsalted butter
• 6 hoagie rolls, lightly toasted

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