Instructions

• Prepare the grill for direct cooking over medium heat (350° to 400°F).
  Prepare the grill for cooking over medium heat (400°F).
• Mix the patty ingredients, and then gently form four patties of equal size, each about ¾ inch thick. With your thumb or the back of a spoon, make a shallow indentation about 1 inch wide in the center of the patties to prevent them from forming a dome as they cook. Refrigerate the patties until ready to grill. Brush the pineapple slices with oil.
• Brush the cooking grates clean. Grill the patties over direct medium heat, with the lid closed, until cooked to medium doneness (160°F), 10 to 15 minutes, turning once or twice. At the same time, grill the pineapple over direct medium heat until lightly charred and softened, about 8 minutes, turning once. Remove from the grill as they are done.
  Brush the cooking grates clean. Grill the patties over medium heat, with the lid closed, until cooked to well done (160°F), 10 to 15 minutes, turning once or twice. At the same time, grill the pineapple over medium heat until lightly charred and softened, about 8 minutes, turning once. Remove from the grill as they are done.
  Brush the cooking grates clean. Grill the patties over direct medium heat, with the lid closed, until cooked to well done (160°F), 10 to 15 minutes, turning once or twice. At the same time, grill the pineapple over direct medium heat until lightly charred and softened, about 8 minutes, turning once. Remove from the grill as they are done.
• Grill the buns, cut side down, over direct medium heat until lightly toasted, about 1 minute. Build the burgers on toasted buns with lettuce, a patty, hoisin sauce, and a pineapple slice. Serve warm. 
  Grill the buns, cut side down, over medium heat until lightly toasted, about 1 minute. Build the burgers on toasted buns with lettuce, a patty, hoisin sauce, and a pineapple slice. Serve warm.