Poisson En Sauce (Fish In Sauce, Haitian-Style)
Preheat oven to 350 degrees Fahrenheit.
Sauté the onion and the garlic in a fry pan, using about 2 Tbsp. oil.
In a small bowl, stir the tomato paste with a cup of water;
Stir this mixture and the vinegar into the sautéed onions and garlic.
Meanwhile, oil the bottom of a large (10x18-inch) rectangular baking pan;
Pour the reduced sauce over the fish steaks, making sure to completely cover the fish with it.
Place the pan in the oven to bake, uncovered, for 30 minutes.
Test fish for doneness before removing from oven.