Preheat oven to 325 degrees.

Grease a 9 inch round cake pan with cooking spray. Set aside.

In a large bowl, add the cake mix, applesauce, vegetable oil, water, lemon juice and lemon zest. Mix with an electric hand mixer on medium for 1 minute or until fully combined. Add the poppy seeds and stir until distributed throughout the batter.

Pour the batter into the prepared cake pan. Bake for 25 to 30 minutes or until a toothpick inserted in the middle comes out clean. Cool completely in the pan.

Once cool, turn over onto a plate to add the glaze.

In a medium bowl, add the powdered sugar, lemon juice and lemon zest. Stir with a whisk until smooth. The glaze should not be thin but thick yet pourable. If the glaze needs to be thicker, slowly add more powdered sugar. If the glaze is too thick, add little more lemon juice.

Drizzle the glaze over the cake and spread to cover the entire top and allow the glaze to drip off on the sides. Garnish with lemon slices and berries.