INGREDIENTS
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3/4 cup farro or pearl barley (see cooks’ note, below)
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3 cups water
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1 tablespoon unsalted butter
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1 tablespoon olive oil
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2 garlic cloves, minced
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9 scallions, finely chopped (1 1/3 cups), divided
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1 lb cremini mushrooms, sliced
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1/4 cup dry Madeira (preferably Verdelho or Sercial)
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1 cup whole-milk ricotta
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1 (1-lb) package frozen all-butter puff pastry, thawed
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1 egg yolk, beaten with 1 tsp water and a pinch of salt