Combine cake mix, pudding mix, eggs, water and oil in large bowl. Beat at medium speed with electric mixer for 2 minutes. Pour into pan.
Bake at 350°F for 50 to 60 minutes or until toothpick inserted in center comes out clean. (I cook mine for 50 mins.) Cool in pan 25 minutes. Invert onto heat resistant serving plate. Cool completely.
For glaze, place frosting in microwave-safe bowl. Microwave on high power 10 to 15 seconds. Stir until smooth. Repeat if necessary. Do not over heat. Add Lemon extract one teaspoon at a time until desired flavor is reached. Stir well. (I use 2 teaspoons for a moderate lemon taste. Add more according to preference.) Drizzle over cake.