Sesame-Hoisin Pork Burgers with Grilled Pineapple

Ingredients

• 1-½ pounds ground pork (80 to 85% lean)
• 3 scallions (white and light green parts only), finely chopped
• 2 teaspoons minced garlic
• 2 teaspoons toasted sesame oil
• 1 teaspoon hot chili-garlic sauce, such as Sriracha
• 1 teaspoon kosher salt
• ¼ teaspoon freshly ground black pepper
• 4 fresh pineapple slices, each ½ inch thick, core removed
• Canola oil
• 4 hamburger buns, split
• 4 leaves romaine lettuce
• 4 teaspoons hoisin sauce