Heat 1 tablespoon of the oil in a large skillet until almost smoking. Add half of the garlic, ginger and jalapeño and stir-fry over high heat until fragrant, about 30 seconds. Add half of the meat and stir-fry until browned in spots, about 2 minutes. Transfer the meat to a plate. Return the skillet to high heat and repeat with the remaining oil, garlic, ginger, jalapeño and beef.