Good-Cooking - Pecan Pie Cake

Ingredients

• 3 cups pecans, finely chopped, toasted and divided
• 1/2 cup butter, softened
• 1/2 cup shortening
• 2 cups granulated sugar
• 5 large eggs, separated
• 1 tablespoon vanilla extract
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 1 cup buttermilk
• 3/4 cup dark corn syrup
• 1/2 cup dark brown sugar, firmly packed
• 1/3 cup cornstarch
• 4 egg yolks
• 1 1/2 cups half-and-half
• 1/8 teaspoon salt
• 3 tablespoons butter
• 1 teaspoon vanilla extract
• 1 (15 ounce) package refrigerated piecrusts
• 1 large egg
• 1 tablespoon water
• 24 pecan halves