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Heat the remaining 2 teaspoons of oil in the same skillet; add onion and saute for 2 minutes. Add the wine and cook until reduced by half, about 2 minutes. Add the tomatoes, olives and capers and crushed red pepper, if using, and cook for 3 minutes more. Stir in the spinach and cook until it is wilted, about 3 minutes. Season with salt and pepper. Spoon the sauce over the fish and serve.