Clean the onion and cut it into freckles. Cloves garlic, cut it in two. Parsley take the leaves and stems cut. Put on the stove pot with a thick bottom, pour olive oil and sliced ​​products. Mix well. After 3 minutes, pour the wine. Stew until no smell of alcohol. In another container pour the tomatoes, ketchup and capers and mix. Put on the stove and when it boils, add the fillets. Add salt and pepper. After stew fish spread it in dishes in portions. Top put stewed onions and sprinkle with parsley leaves.