Preheat oven to 350F/180C for 15 Mins. Lightly grease and line the cake tin with parchment paper. Spray the paper with non stick cooking spray as well.
In a medium size bowl sift together the flour, cocoa powder, baking soda and salt. Break the lumps in baking soda if any and mix it well with the flour.
In another bowl mix together the water, applesauce, oil, lemon juice and vanilla extract.
Pour the wet ingredients over the dry mixture and stir until just moistened.
Fold in the apples and sugar into the batter and pour it in the prepared pan.
Bake it for 30-35 minutes or until a toothpick inserted in the center of the cake comes out clean. I checked mine after 30 minutes and it was done perfectly.
Notes
The original recipe mentioned to use ⅔rd cup of sugar which is approximately 10 tablespoons. I read the review which mentioned that the apple cake was not sweet enough, so I increased it to ¾th cup; which is approximately 12 tablespoons. I felt that the cake could have been a bit more sweet. I don't mind the mild sweetness but another 2 tablespoons wouldn't have hurt. So if you have a sweet tooth you may want to increase the quantity of sugar.