Banana Coconut Cake

Name: Banana Coconut Cake
Ingredients: 7 ounces unsalted butter; 1 1/2 cups granulated white sugar; 3 large eggs; 1/2 cup buttermilk; 1 1/3 cups mashed ripe banana; 1 1/3 cups sifted cake flour; 1 teaspoon baking powder; 3/4 teaspoon salt; 3/4 teaspoon baking soda; 1/2 cup finely chopped pecans; 1 can (13.5 ounces) unsweetened coconut milk*; 1 cup milk; 2/3 cup white sugar; 5 egg yolks; 1/3 cup cornstarch; 3 bananas, sliced; 1/4 cup lemon juice; 2 tablespoons white sugar; 1 cup unsweetened coconut flakes, toasted golden brown