Start by patting the salmon fillets dry with paper towels, especially the skin, to ensure maximum crispiness.
In a small mixing bowl, whisk together soy sauce, honey, minced garlic, sesame oil, lemon juice, and black pepper until well combined. This creates a fragrant marinade and glaze.
Place the salmon fillets in a shallow dish or zip-top bag and pour half of the soy mixture over them, ensuring the flesh is well coated. Marinate in the fridge for at least 30 minutes, flipping halfway, to let the flavors seep in.
Preheat your air fryer to 400°F (200°C) for about 3 minutes to ensure a hot cooking environment for crispy results.
Remove the salmon from the marinade, letting excess drip off, and place the fillets skin-side down in the air fryer basket. Lightly brush the tops with the remaining soy glaze.
Cook the salmon at 400°F for 6 minutes, then open the air fryer and carefully flip the fillets to skin-side up. Brush with a little more glaze for extra flavor.
Continue cooking for another 6 minutes, or until the skin is crispy and the salmon flesh turns opaque and flakes easily with a fork. You'll hear that satisfying sizzle and crack as the glaze caramelizes.
Remove the salmon carefully from the air fryer, letting it rest for a minute. Then, serve immediately, enjoying the crispy crust and tender, flaky interior with a drizzle of any remaining glaze if desired.