Orange Cake with Chocolate Frosting

2 cups granulated sugar
1 cup butter
3 1/2 cups cake flour
1 cup milk
6 egg yolks
1 1/2 teaspoons baking powder
2 teaspoons orange or vanilla extract
1/8 teaspoon salt
1 shot Grand Marnier
1/2 cup orange peel
1 jar Nutella
1 cup finely chopped walnuts

Preheat oven 350 degrees F.

Mix everything slowly for 4 minutes and pour into a Bundt pan. Bake for 45 to 50 minutes until a wooden pick inserted in the center comes out clean. Cool cake in pan 10 minutes, then remove from pan and cool completely.

Sprinkle some chocolate chips on top.

When the cake is cooled, spread the Nutella chocolate over cake and sprinkle with walnuts.