Ingredients

  • Crust:
  • 1 1/2 cups all-purpose flour
  • 1/3 cup white sugar
  • 3/4 cup butter, cubed
  • Sweet Potato Layer:
  • 1/2 cup butter, softened
  • 1/2 cup white sugar
  • 2 eggs
  • 3 cups cooked and mashed Japanese purple sweet potatoes
  • 1/2 cup milk
  • 1 teaspoon vanilla extract
  • Haupia Layer:
  • 1 1/4 cups cold water
  • 1/2 cup white sugar
  • 1/2 cup cornstarch
  • 2 (14 ounce) cans coconut milk
  • 2 cups shredded coconut

Method

  • Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
  • Mix flour and 1/3 cup white sugar together in a large bowl. Rub in butter with your fingers until mixture is sandy. Press into the greased baking pan.
  • Bake crust in the preheated oven until golden brown around the edges, about 10 minutes.
  • Beat 1/2 cup butter and 1/2 cup white sugar in a bowl with an electric mixer until creamy. Beat in eggs one at a time. Mix in mashed sweet potatoes, milk, and vanilla extract until batter is the consistency of pancake batter. Pour over the crust.
  • Bake in the preheated oven until sweet potato layer is firm, about 30 minutes.
  • Whisk water, 1/2 cup white sugar, and cornstarch together in a small bowl until smooth.
  • Pour coconut milk into a 5-quart saucepan. Bring to a simmer over low heat, about 5 minutes. Pour in water mixture, whisking constantly until coconut milk thickens, 3 to 5 minutes. Stir in shredded coconut; cook and stir until mixture thickens, about 5 minutes more.
  • Pour coconut mixture over sweet potato layer. Refrigerate until firm, 4 hours to overnight.