Melt the butter with the oil in a large deep skillet or Dutch oven over medium heat. Add the shallots and cook, stirring frequently, until softened, about 3 minutes. Add the orange juice and lemon juice and cook until reduced by half, about 3 minutes. Add the kale in batches, tossing with tongs until it begins to wilt, then adding more; continue until all the kale is wilted, 4 to 6 minutes. Add the orange zest, 3/4 teaspoon salt, a few grinds of black pepper, coriander and red pepper flakes and toss to combine. Transfer the kale with tongs to a serving bowl or platter and serve warm.
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