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Divide the ground beef into eight loose 75 g balls without adding any extra seasoning, and finely chop the red onion. Preheat the plancha until very hot, place the meat balls on it, and immediately press them down thinly with a firm spatula. Season the tops evenly with the Mexican seasoning, flip the patties after about 2 minutes, and top with Cheddar. Cook the patties all the way through, toast the buns, spread with mayonnaise, and top each with two patties, onion, and jalapeños.
For preparation without a grill, heat a heavy cast-iron pan until very hot and work in batches.
Sprinkle on the seasoning only after smashing, and cook the ground beef all the way through for consumers.