In a small bowl, whisk the soy sauce, mirin, sugar or honey, garlic powder, onion powder, ginger powder, water, and cornstarch until very smooth.
1 tbsp soy sauce, ½ tbsp mirin, 1 tsp brown sugar or honey, Pinch garlic powder, Pinch onion powder, Pinch ginger powder, 2 tbsp water, 1/2 tbsp cornstarch