Ingredients

• 2 red apples, cored (such as Fuji, Gala, or Pink Lady)
• 1 lb ground beef
• 1/4 cup fine dry breadcrumbs
• 1 Tbs plus 2 tsp chili crisp, divided, plus more for serving
• 1/2 tsp salt
• 2 (1/3-inch) slices red onion
• 4 hamburger buns
• 1/4 cup mayonnaise

Directions

1. Slice 1 apple using a mandolin slicer to create 8 (1/4-inch-thick) slices. Shred any remaining scraps plus all or part of the second apple to get 1/2 cup shredded apple. Squeeze shredded apple to extract some of the moisture. Reserve any remaining apple for another use.
2. Preheat an outdoor grill to medium heat (350-375 degrees).
3. Combine ground beef, breadcrumbs, 1 Tbs chili crisp, salt, and the 1/2 cup shredded apple in a bowl. Shape and tightly pack into 4 (1/2-inch-thick) patties, 4 inches in diameter.
4. Oil the grill grate. Grill patties, covered, carefully turning halfway through, until an instant-read thermometer inserted into centers of patties reads 160 degrees, 10-13 minutes. Grill onion slices, turning halfway through, 8-10 minutes. Grill apple slices, turning halfway through, 4-5 minutes. If you like, grill buns, cut sides down, until toasted, 1-2 minutes. When onions are cool enough to handle, separate rings.
5. Stir mayonnaise and remaining 2 tsp chili crisp together in a small bowl. Spread buns with mayonnaise mixture and fill with patties, onion, and apple slices. Serve with additional chili crisp.