Make the marinade: Whisk together the soy sauce, brown sugar, sesame oil, garlic, ginger, grated pear, green onions, and black pepper in a bowl.
Marinate the beef: Add the thinly sliced beef, toss to coat, and marinate at least 30 minutes (up to overnight).
Prep the zucchini: Toss the zucchini half-moons with the neutral oil and salt.
Preheat the air fryer to 400°F (204°C).
Cook the beef: Air fry in a single layer (in batches) for 8–10 minutes, flipping halfway, until caramelized.
Cook the zucchini: Air fry for 6–8 minutes, shaking halfway, until crisp-tender.
Serve: Combine, garnish with sesame seeds and green onion, and serve hot over rice.