Taillevent's Chocolate Cake W/pistachio Sauce

• 4 egg yolks
• 2 eggs
• 1 egg (white)
• 1/2 shelled pistachios (roasted)
• 475 ml milk
• 200 gr sugar
• 140 gr best quality bittersweet
• 50 gr butter (unsalted)
• 8 gr confectioners sugar