Rinse, score, and pat dry the stingray thoroughly. Create shallow cuts for better marinade absorption.
Blend BBQ Seafood Spice, diced onions, and water in a Ninja® blender. Sauté in the SmartLid™ by moving slider to AIR FRY/HOB mode and selecting SAUTÉ function on setting 3 for 5 minutes. Let it cool down.
Evenly coat both sides of the stingray with the blended sauce, ensuring the marinade seeps into cuts. Squeeze the juice of 1 calamansi lime over the stingray and marinate for 30 minutes to 1 hour in the fridge.
Select the AIR FRY function and preheat the SmartLid™ at 180°C for 5 minutes. Place marinated stingray on banana leaf or foil into crisp basket, fold to create a secure packet and close lid.
Select GRILL function and cook for 10-12 minutes; halfway through, open lid to flip the stingray and cook until stingray is opaque and flakes easily with a fork.
Carefully unwrap, squeeze remaining calamansi juice, garnish with cilantro, red onion, cincalok, and serve immediately.
