Chocolate Genoise Cake

Ingredients

• 6 Egg yolks
• 1/2 c Unsalted butter
• 2 Squares semisweet chocolate
• 1 ts Vanilla
• 1 c All-purpose flour
• 1 c Sugar
• 1/3 c Water
• 4 ts Instant espresso coffee
• 6 Slightly beaten eggs
• 1 1/2 c Unsalted butter; softened
• 1/4 c Semisweet chocolate pieces;