Step 1

In a bowl, combine fish and soy sauce. Marinate for about 30 minutes in the refrigerator. Drain well.

Step 2

In a bowl, whisk egg until frothy.

Step 3

In another bowl, combine flour, cornstarch, and salt and pepper to taste.

Step 4

Dredge fish fillets in flour mixture, dip in the beaten egg, and then dredge again in flour mixture to fully coat.

Step 5

In a pan over medium heat, heat about 1-inch deep of oil. Add battered fish fillets and cook, turning once or twice, until golden and cooked through. Remove from pan and drain on paper towels.

Step 6

In a bowl, combine pineapple juice, vinegar, ketchup, sugar, cornstarch, and salt. Stir until smooth.

Step 7

In a pan over medium heat, heat about 1 tablespoon oil. Add bell peppers and onions and cook, stirring regularly, until half cooked. Remove from pan and set aside.

Step 8

In the pan, add sauce mixture and bring to a boil, whisking regularly, for about 2 to 3 minutes or until thickened.

Step 9

Add bell peppers and onions and cook for about 1 minute or until tender yet crisp.

Step 10

Add fried fish fillets and cook and toss quickly just until coated with sauce. Serve hot.