Sweet Potato Souffle Pie

Ingredients

• Pinch of cream of tartar
• 9 sheets phyllo dough (17 by 12 inches), thawed if frozen
• ¼ teaspoon ground cinnamon, plus more if needed
• ¹/₃ cup, plus ¼ cup granulated sugar, plus more if needed
• ¼ cup all-purpose flour
• ¼ cup unsalted butter, plus ½ cup melted, plus more for pan
• 1 2-inch piece peeled fresh ginger, thinly sliced
• + 7 more ingredients
• • 1 cup whole milk
  • 2 tablespoons packed light-brown sugar
  • 4 large eggs, separated
  • ¼ teaspoon salt
  • ½ teaspoon pure vanilla extract
  • ¼ teaspoon ground ginger
  • 2 medium sweet potatoes, pierced with the tines of a fork

1. Preheat oven to 400 degrees. Bake potatoes until tender, 1 hour to 1 hour 15 minutes. Remove from oven; let stand until cool enough to handle. 2. Peel potatoes, and press through a ricer into a large bowl (you should have about 1 cup); let cool completely. Stir in ground ginger, vanilla, salt...

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