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1
In a large frying pan, heat 1 tablespoon of the oil over moderately low heat. Add half the onions and cook, stirring occasionally, until translucent, about 5 minutes. Increase the heat to moderately high and add the spinach and 1 teaspoon of the salt. Cook, stirring, until no liquid remains in the pan, about 10 minutes. Drain and press all remaining liquid from the spinach.
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2
In the same pan, heat the remaining tablespoon of oil over moderately low heat. Add the remaining onion and cook, stirring occasionally, until translucent, about 5 minutes. Add the garlic and cook for 1 minute, stirring. Stir in the tomato puree, water, pepper, and the remaining 1/2 teaspoon salt. Bring to a simmer and cook, stirring occasionally, for 15 minutes. Stir in the butter and basil and cover to keep warm.
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3
Meanwhile, bring a medium pot of salted water to a simmer. In a medium bowl, combine the cooked spinach, ricotta, Parmesan, eggs, lemon zest, nutmeg, cayenne, and flour. Using two tablespoons, drop walnut-size dumplings into the simmering water. Cook until firm, about 3 minutes. Remove with a slotted spoon and drain on paper towels. Serve with the tomato sauce.
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4
Wine Recommendation: Tomatoes require a high-acid wine, while earthy spinach is best with one that has bright, uncomplicated fruit. Sounds like barbera, but no oak please.
