Mushroom and Farro Pie Recipe | Epicurious

Ingredients

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