Sweet Chocolate Cake/1953 Pillsbury Bakeoff

• 3 egg yolks
• 3 squares
• 3 egg whites frosting
• 500 gr confectioners sugar
• 250 gr all purpose flour
• 240 ml milk
• 200 gr sugar
• 140 gr semisweet chocolate
• 95 gr shortening
• 45 ml milk