Polenta-Crusted Fish Cakes with Spicy Tomato Sauce

PREPARE THE SAUCE In a large skillet, heat the olive oil. Add the garlic and chile and cook over moderately low heat until fragrant, about 3 minutes. Add the tomatoes and cook over moderate heat until thickened, about 10 minutes. Stir in the tomato paste and water and simmer for 2 minutes longer. Add the tarragon and season with salt. MEANWHILE, PREPARE THE FISH CAKES In a saucepan, cover the potatoes with water and bring to a boil. Boil over moderately high heat until tender, about 7 minutes. Drain well and lightly mash the potatoes with a fork. Spread the polenta in a pie plate. In a food processor, combine the fish, garlic, parsley, cilantro, salt, cumin, egg and crushed red pepper and pulse until the fish is coarsely chopped. Transfer to a bowl and fold in the potatoes. Form the mixture into twelve 2-inch cakes (1/2 inch thick); coat with the polenta. In a large nonstick skillet, heat 1 tablespoon of the oil. Add half of the fish cakes and pan-fry over moderately high heat until golden brown and just cooked through, about 3 minutes per side. Transfer to a platter. Repeat with the remaining 1 tablespoon of oil and fish cakes, adjusting the heat if the cakes get too dark. Serve the fish cakes hot or at room temperature with the warm tomato sauce. MAKE AHEAD The tomato sauce can be refrigerated overnight. Reheat gently.