Cognac Ice Cream with Chocolate Truffles

Ingredients

• 9 egg yolks
• 2/3 cup sugar
• 2 cups heavy cream
• 2 cups milk
• 1/4 cup Cognac liqueur
• 4 ounces semisweet chocolate
• 1 ounces unsweetened chocolate
• 5 tablespoons butter
• 1/2 cup plus 2 tablespoons heavy cream
• 1 to 2 tablespoons Cognac liqueur