Caramelized-apple gateau basque Recipe - Los Angeles Times

Ingredients

• Zest from one orange
• 1 cup (2 sticks) butter, room temperature
• 1 cup plus 3 tablespoons sugar
• 2 eggs, room temperature
• 1 1/4 teaspoons salt
• 1 1/2 teaspoons baking powder
• 3 1/4 cups flour
• 3 1/2 pounds medium Granny Smith apples (about 8)
• 3 cups sugar
• 1 vanilla bean, cut in half lengthwise, seeds scraped
• 2 tablespoons ( 1/4 stick) butter
• 1 cup creme fraiche
• 2 tablespoons brown sugar
• 1/8 teaspoon lemon zest
• Caramel apple filling
• 1 egg yolk, beaten
• Whipped creme fraiche