Black Bean Garlic Sauce (which is delicious on pork ribs too) and Seasoned Soy Sauce for Seafood are the secret ingredients worth hunting down for this dish. Lee Kum Kee is a common brand that makes both products, and they can be found in Chinatown or an Asian-mart like Ranch 99.
Serve the fish over some white jasmine rice or soba noodles and you'll have a light, summer dinner ready in no time.

Ingredients for Cantonese Sea Bass
"Steamed" Sea Bass, Cantonese Style
Serves: 4
Ingredients:
4 (6 oz.) Chilean sea bass fillets (or 1 1/2 lb. Chilean sea bass steak, you can commonly find these frozen in Asian-marts, just it thaw out first)
Pinch of salt and white pepper
1 teaspoon cornstarch
½ teaspoon black bean garlic sauce (Lee Kum Kee)
2-3 slices peeled ginger
2-3 pieces scallion
1 teaspoon soy sauce for seafood (Lee Kum Kee)
1 teaspoon vegetable oil
Preparation:
1. Rinse and pat dry fish.
2. Sprinkle salt, white pepper, and cornstarch on both sides.
3. Coat all over with black bean garlic sauce.
4. Julienne the slices of ginger; place on top of fish.
5. Remove the wilted tops and root ends of the scallion. Make a slit, splitting the bottom white part lengthwise. Cut on the bias in 2 inch pieces. The pieces will look large, but don't worry, they will shrink when you cook it; place on top of fish.
6. Drizzle the soy sauce and vegetable oil on top.
7. Cover with plastic wrap and microwave for about 8 minutes.