Begin to thaw frozen catfish beforehand.
Add water and cup of rice to the pot.
Turn stove to medium high heat and stir. Once it starts to boil, adjust the temperature to simmer. Cook for 10 to 12 minutes.
Preheat oven to 400 degrees F.
Add aluminum foil to a large baking sheet and set it aside.
Cut peppers and onions in thin strips.
Cut pineapple into cubes.
Add chopped produce and fish into a bowl.
Combine teriyaki sauce, corn starch, sesame oil and brown sugar with the produce and fish.
Stir until produce and fish are well-covered.
Spread produce and fish on prepared baking sheet and place in the oven for 18 to 20 minutes.
Once the fish is cooked through and flaky, begin plating.
Layer rice, produce and fish in a bowl and top with fresh scallions and sesame seeds.