INGREDIENTS
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the filling:
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• 1¼ pound small beets, peeled and cut in a similar size to the onions
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• 1¼ to 1½ pounds small to medium red onions, cut into quarters
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• 2 tablespoons olive oil, divided
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• 4 sprigs of thyme
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• ¼ cup brown sugar
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• ¼ cup balsamic vinegar
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• Sea salt
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• Freshly ground black pepper
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• 2 ounces hard goat cheese, Pecorino, or Parmesan
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For the pastry:
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• ¾ cup cake flour, plus extra for dusting
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• ¾ cup whole-wheat flour
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• Pinch of salt
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• ¾ cup butter, cut into small cubes
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• ⅓ cup ice-cold water
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• 2 teaspoons melted butter or 1 beaten egg