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Cook, bake, or microwave the sweet potatoes until done but still nice and firm, allowing 2 to 3 minutes per potato. If you’d like to keep the skins on, scrub them well. Otherwise just rinse.
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Once cool enough to handle, cut them into large dice, leaving skins on if you had scrubbed them.
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Heat half of the oil together with the soy sauce in a stir-fry pan. Add the tempeh and stir quickly to coat. Sauté over medium heat until golden and beginning to turn crisp, about 5 to 7 minutes, stirring frequently. Remove to a plate then set aside until needed.
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Meanwhile, cut the leafy part of the kale away from the stem, then coarsely chop into bite-sized pieces. Rinse well.
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Heat the remaining oil in the stir-fry pan. Add the garlic and sauté over low heat until golden.
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Add the kale along with about 1/2 cup water, the tomatoes, curry powder, and optional curry paste. Cover and cook over medium heat for 8 to 10 minutes, or until the kale is tender but still bright green.
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Stir in the diced sweet potatoes, tempeh, and scallions and/or cilantro and cook, uncovered, for 2 to 3 minutes longer. Season with salt and pepper, sprinkle with the cashews, and serve at once.