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Warm a large cast-iron or other heavy skillet over medium heat. Add 4 tablespoons butter and melt. Add the sage to the pan, toss it in the butter, and brown until lightly crisped, 1 to 2 minutes. Set aside, reserving the skillet.
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Preheat the oven to 400°F. Add the remaining 2 tablespoons butter and the sea salt to the skillet with the butter used to fry the sage and heat over medium-high heat until the butter is melted. Add the squash, toss quickly to coat, and cook, tossing once or twice, until the squash is lightly browned on at least one side, 8 to 10 minutes. Transfer the squash to a baking sheet, arranging it in one well-spaced layer. Roast until the squash is crispy and firm outside and soft on the inside, 20 to 25 minutes.
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When cool enough to handle, skewer 3 to 5 squash cubes on 6- to 8-inch skewers.
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Drizzle with honey to lightly coat, sprinkle with the feta cheese, crumble and sprinkle the fried sage, and garnish the platter with a few whole leaves, if desired. Enjoy warm.