Pre heat oven to 350 degrees. Grease a tube cake pan (very very well), or whatever type of pan you would like to use. Keep in mind, this is a very large and dense cake and needs room to expand without spilling over! You need 3 bowls, one large and two medium sized.
First, peel core and chop the apples and toss them with the cinnamon, sugar and lemon juice in one of the medium sized bowls. Place these aside until later.
Mix together the flour, and baking powder in the large mixing bowl. In the other medium sized bowl wisk together oil, orange juice, sugar and vanilla.
Slowly begin to combine the wet ingredients into the dry ingredients. After these are combined being to mix in the eggs one at a time. It is important to keep scraping down the sides of the bowl to make sure that all ingredients are mixed together very well.
There are two ways to finish this recipe and put it into the oven. I like to mix the apples into the batter after it is completed. However, some websites I have seen that make a cake similar to this like to layer the apples. It is up to your personal taste! Whatever you choose, is going to be fantastic.
Stick the cake into the 350 degree oven for about 1 and a 1/2 hours, or until a cake tester comes out clean!