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1
Warm the olive oil in a wide, heavy pan over medium heat. Add the onion and garlic and cook, stirring occasionally, until softened and translucent.
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2
Add the chopped tomatoes, raise the heat to high, and cook — stirring regularly — until the mixture thickens and the raw tomato smell cooks off, about 10 minutes.
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3
Stir in the sugar, crumbled bay leaves, and shredded fish. Cook together for 3 minutes.
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4
Add the parsley, raisins, olives, capers, and oregano. Reduce the heat to medium and continue cooking, stirring frequently, until the mixture is fairly dry and holds its shape.
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5
Taste and adjust salt. Serve on tostadas, as a taco or empanada filling, or alongside white rice.