1 white or yellow cake mix
1 small pistachio pudding
1 c. oil
1/2 c. chopped walnuts
1 c. club soda
3 eggs

Mix all ingredients until smooth.

Bake at 350°F for 45 minutes in a Bundt pan.

Frosting:

1 pkg. instant pistachio pudding
1 c. cold milk
1 medium size Cool Whip

Beat pudding and milk until thick. Fold in Cool Whip. Frost and refrigerate.