Instructions

• Mix the patty ingredients, and then gently form four patties of equal size, each about 18 millimeters thick. With your thumb or the back of a spoon, make a shallow indentation about 2.5 centimeters wide in the center of the patties to prevent them from forming a dome as they cook. Cover and refrigerate the patties until ready to grill.

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  Chopping Parsley
• Prepare the grill for direct cooking over medium heat (180° to 230°C).
  Prepare the grill for cooking over medium heat (200°C).
• Lightly brush the patties, onion slices, and pineapple rings with oil. Brush the cooking grates clean. Grill the patties over direct medium heat, with the lid closed, until fully cooked (74ºF), 12 to 14 minutes, turning once. At the same time, grill the onion slices until tender and the pineapple rings until heated through, 4 to 6 minutes, turning once or twice. During the last minute of grilling time, toast the buns over direct heat. Remove from the grill as they are done.
  Lightly brush the patties, onion slices, and pineapple rings with oil. Brush the cooking grates clean. Grill the patties over medium heat, with the lid closed, until fully cooked (74ºF), 12 to 14 minutes, turning once. At the same time, grill the onion slices until tender and the pineapple rings until heated through, 4 to 6 minutes, turning once or twice. During the last minute of grilling time, toast the buns over direct heat. Remove from the grill as they are done.
• Separate the onion slices into rings. Spread the buns with mustard and mayonnaise. Build each burger on a bun with a patty, a pineapple ring, and onion. Serve warm.