For the zabaglione: In a medium bowl, whisk together the egg yolks, wine, sugar, and cayenne pepper. Place the bowl over a pan of gently boiling water and whisk vigorously until thick and foamy, 6 to 8 minutes. Set aside.
For the chocolate sauce: Reduce the pan of water to a simmer. Place the chocolate chips and cream in a small bowl. Place the bowl over the pan of simmering water and stir until the chocolate has melted and the mixture is smooth, about 5 minutes.
Spoon the chocolate sauce into 4 small dessert bowls. Arrange the sliced strawberries on top. Spoon the zabaglione on top of the strawberries and sprinkle with the pistachio nuts, if using.
Recipe courtesy of Giada De Laurentiis