Preheat oven to 350 degrees.
Grease and flour fluted bundt pan and set aside.
In a large mixing bowl, combine cake mix, eggs, water, oil, lemon pudding mix, lemon zest and lemon juice, and beat with an electric mixer for about 2 minutes.
Pour into prepared pan and bake at 350 degrees until done (about 35-45 minutes).
Remove from oven and allow to cool for about 10 minutes.
Turn out onto serving plate and drizzle with lemon icing or dust with powdered sugar.
Lemon Icing:
Open icing, remove and discard foil lid.
Microwave on high for about 20 seconds and stir well. (Microwave until icing reaches a pourable consistency.)
Stir in lemon zest and fresh lemon juice to taste, mix well.
Pour over cooled cake and serve.
Garnish with fresh lemon slices if desired.