Ingredients
1-1/2  pounds fresh or frozen skinless red snapper or other fish fillets, 1/2 to 3/4 inch thick
1/8  teaspoon salt
1/8  teaspoon black pepper
1  large onion, sliced and separated into rings
2  cloves garlic, minced
1  tablespoon cooking oil
2  large tomatoes, chopped (2 cups)
1/4  cup sliced pimiento-stuffed green olives
1/4  cup dry white wine
2  tablespoons capers, drained
1  to 2 fresh jalapeno or serrano chile peppers, seeded and chopped, or 1 to 2 canned jalapeno chile peppers, rinsed, drained, seeded, and chopped 
1/2  teaspoon sugar
1   bay leaf
   Snipped fresh parsley

Directions
1. Thaw fish, if frozen. Rinse fish; pat dry with paper towels. Cut fish into 6 serving-size pieces. Sprinkle fish with salt and black pepper.
 
2. For sauce, in a large skillet cook onion and garlic in hot oil until onion is tender. Stir in tomatoes, olives, wine, capers, jalapeno peppers, sugar, and bay leaf. Bring to boiling. Add fish to skillet. Return to boiling; reduce heat. Cover and simmer for 6 to 10 minutes or until fish flakes easily when tested with a fork. Use a slotted spatula to carefully transfer fish from skillet to a serving platter. Cover and keep warm. 

3. Boil sauce in skillet for 5 to 6 minutes or until reduced to about 2 cups, stirring occasionally. Discard bay leaf. Spoon sauce over fish. Sprinkle with parsley. Makes 6 servings. 

Source:  Better Homes & Gardens