Three white-chocolate cake layers are finished with a cooked coconut-pecan frosting. Separate the cake eggs carefully and fold their beaten whites into the batter without knocking out all the air. The yolk-based frosting needs a temperature check and refrigerated storage. Set up separate ingredient groups for the cake and frosting. The cake needs four whole eggs separated into four yolks and four whites; the frosting needs five additional yolks. The evaporated milk total is fifteen ounces from three five-ounce cans, not three large cans, and sweetened condensed milk is a different ingredient. Melt the white baking chocolate gently and let it lose its heat before adding it to the butter mixture. Keep the bowl and beaters for the egg whites free of grease. Divide batter evenly among the three pans and rotate their positions only if needed for your oven. Stir the frosting across the bottom and corners of the saucepan to prevent scorching, and check its temperature instead of relying on thickening alone. Cool the cake layers completely before stacking so the filling stays between them.