Feta Florentine Burgers with Frizzled Prosciutto on Parmesan-Toasted Ciabatta Rolls

Ingredients

• 6  ciabatta rolls split
• 0.5 cup feta cheese crumbled
• 6 slices mozzarella cheese fresh (1/)
• 1  garlic clove peeled cut in 1/2 lengthwise
• 3 cups mesclun greens 
• 2.5 pounds ground sirloin 
• 0.8 cup mayonnaise 
• 2 tablespoons oil-packed sun-dried tomatoes drained chopped
• 2 tablespoons olive oil extra-virgin (recommended: Colavita)
• 4 tablespoons olive oil extra-virgin (recommended: Colavita)
• 6 tablespoons parmesan freshly grated
• 1.5 cups pancetta thinly sliced
• 0.5 cup bell pepper red finely chopped
• 2 teaspoons salt 
• 1.5 cups spinach leaves fresh thinly sliced
• 6 servings vegetable oil for brushing on the grill rack
• 1 cup mushrooms white chopped
• 0.5 cup onion white finely chopped

Equipment

• bowl
• frying pan
• paper towels
• grill
• spatula

Directions

1. Prepare a medium-hot fire in a charcoal grill with a cover, or preheat a gas grill to medium-high.
2. Combine the mayonnaise and sun-dried tomatoes in a small bowl and mix well. Cover and refrigerate until ready to use.
3. Place the oil in a 12-inch fire-proof skillet and set on the grill rack. When the oil is hot, add the onion, bell pepper, and mushrooms. Cook, stirring frequently, until tender, about 5 minutes.
4. Add the spinach leaves and cook until the spinach is wilted, about 3 minutes.
5. Transfer to a large bowl and add the sirloin, feta cheese, and salt. With your hands or a large spoon, gently mix well, handling the meat as little as possible to prevent compacting it. Form into 6 equal-sized patties.
6. Pour the oil into the same skillet and place on the grill rack. When the oil is hot, add the prosciutto. Cook until well crisped, about 5 to 8 minutes.
7. Transfer to a paper towel-lined plate to drain; set aside.
8. When the grill is ready, brush the grill rack with vegetable oil.
9. Place the patties on the rack, cover, and cook until the bottoms are brown, about 4 minutes. With a spatula, turn over the patties and cook an additional 4 minutes, or until done to your preference (internal temperature of 160 degrees F). During the last few minutes of grilling, top each patty with a slice of mozzarella cheese until melted. Lightly brush the cut sides of the rolls with the 4 tablespoons olive oil. Rub the cut sides of the garlic over the insides of the rolls, then sprinkle and press with the Parmesan.
10. Place the rolls, cut sides down, on the outer edges of the grill rack to toast lightly.
11. Spread the mayonnaise mixture on the insides of the warm toasted rolls.
12. Layer the bottom rolls with divided greens, the patties, and divided frizzled prosciutto. Top with the remaining rolls, serve, and enjoy!