Griddled and Grilled Monterey Jack Cheese Burgers With Spicy Chipotle Caramelized Onions and Cilantr

Ingredients

• 2 1/2 pounds ground beef (80 percent lean)
• 1/4 cup cold water
• 1 1/2 teaspoons kosher salt (divided)
• 1 1/2 teaspoons ground black pepper (divided)
• 2 tablespoons unsalted butter or olive oil
• 6 small to medium sweet onions, thinly sliced
• 2 tablespoons puréed or minced chipotle in adobo sauce
• 4 tablespoons thinly sliced scallions
• 2 tablespoons coarsely chopped fresh cilantro
• 2 tablespoons fresh Italian (flat-leaf) parsley leaves
• 6 slices Monterey Jack cheese
• 6 hamburger buns