Firstly, let´s make the homemade sauce. In a medium sauce pan bring the pineapple juice, ketchup, soy sauce ad vinegar to a boil. Cook for 1-2 minutes. Dissolve the cornstarch in the water. Add to the sauce and using a wire whisk mix it well. Cook for 5-10 minutes until it thickens perfectly. It will thicken when it cools too.
Cook the cauliflower in salted water for 5-10 minutes until fork-tender. Drain it under cold water.
Evenly cover the cauliflower with the cornstarch and the garlic powder. Season with salt and pepper.
Transfer the cauliflower into the basket of the airfryer, drizzle some olive oil all over. Bake it at 200C for 30 minutes or until nice and crispy. I like to mix it every 10 minutes so that it bakes evenly.
Mix the cauliflower together with the sauce.
Sprinkle some sesame seeds all over, serve with steamed rice and spring onions.