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Add the ground beef, grated onion, garlic, egg, panko, olive oil, parsley, cumin, salt, and black pepper to a large bowl.
Mix gently with your hands until just combined. Do not overmix.
Cover and refrigerate for 20 minutes.
Take portions about the size of a walnut.
Roll lightly into balls, then gently flatten them between your palms into slightly thick patties.
Heat a cast-iron grill pan over medium-high heat. Lightly oil the pan once hot.
Place the meatballs on the hot pan and cook for 2–3 minutes per side, turning once, until both sides are nicely browned and cooked through.
Serve warm. Bon appétit. Afiyet olsun.