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1
To make the rhubarb sauce, clean the rhubarb stalks by pulling off the heavy filaments, much as you would pull strings from celery.
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2
Cut crosswise into 1 1/2-inch pieces. Place the pieces in a saucepan and add the water. Bring to a boil over high heat, reduce the heat to low, and simmer, uncovered, until the rhubarb has melted into a puree and is tender, 8-10 minutes.
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3
Warm the olive oil in a saute pan over medium heat. Add the tomatoes and cook, stirring occasionally, until the tomatoes are reduced to a thick sauce, about 15 minutes. If using canned tomatoes (I did), skip this step and proceed to 4.
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4
Add the wine, 1 tablespoon honey, and the lemon juice and zest, if using, and stir well. Add the tomatoes to the rhubarb puree, or vice versa, and mix well. NOTE: I used 2 tablespoons of honey and omitted the lemon juice and zest.
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5
Simmer, uncovered, over low heat until the sauce is thick and rich, about 20 minutes. Season with salt, pepper, and the cinnamon, if using. Taste and adjust the sweet-and-sour balance, adding a bit more honey if needed. Keep warm.
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6
While the sauce is cooking, preheat the oven to 400 degrees. Arrange the fish fillets in a single layer in a baking dish. Spoon some of the sauce over them, covering them completely. Cover and bake until the fish tests done when the point of a knife is inserted into the thickest part, about 15 minutes.
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7
Transfer the fillets to a platter and spoon the rest of the warm sauce over them. Serve at once. I recommend a side of pasta, brown rice or gnocchi to soak up the extra sauce!
