Sausage Burgers with Grilled Green Chiles

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Ingredients

1. 2 1/2 pounds ground pork
2. 2 tablespoons minced garlic, plus 4 garlic cloves, thinly sliced
3. 2 tablespoons balsamic vinegar
4. 1 teaspoon crushed red pepper
5. 1 teaspoon chopped thyme
6. Kosher salt and freshly ground pepper
7. 5 large fresh Anaheim chiles
8. 1 large poblano chile
9. 2 tablespoons extra-virgin olive oil
10. 1/2 teaspoon chopped rosemary
11. 6 ounces Gruyère or Italian Fontina cheese, cut into 6 slices about 1/4 inch thick
12. 6 ciabatta or kaiser rolls, split and lightly toasted
13. 1/4 cup plus 2 tablespoons whole-grain or Dijon mustard
14. 2 cups arugula leaves
15. 1 large Creole tomato (see Note) or beefsteak tomato, cut into 6 slices

1. In a large bowl, gently mix the ground pork with the minced garlic, balsamic vinegar, crushed red pepper, thyme, 1 tablespoon of kosher salt and 2 teaspoons of black pepper. Pat the meat into 6 burgers, cover with plastic wrap and refrigerate.
2. Light a grill. Grill the Anaheim and poblano chiles over a hot fire, turning, until charred all over. Transfer to a bowl, cover with plastic wrap and let steam for 10 minutes. Peel, stem and seed the chiles, then cut them into long, thin strips. Transfer the chiles to a bowl and add the olive oil, rosemary and sliced garlic. Season with salt and pepper.
3. Grill the burgers over a hot fire until just cooked through, about 5 minutes per side. About 1 minute before the burgers are done, place a slice of cheese on each burger.
4. Spread the bottom half of each roll with 1 tablespoon of mustard. Top with the arugula and a tomato slice. Set the burgers on the tomato slices and cover with the marinated chiles. Close the sandwiches and serve.