Preheat the oven to 350 F. Spray a tube or Bundt pan with baking spray.
Before you cut the apples, add the vinegar to the almond milk and let it sit and start to curdle a little to make the vegan buttermilk.
Separate the apple chunks from the slices. Squeeze the lemon juice onto the apple slices and the chunks; set aside.
In a large bowl, whisk together the flours and the baking powder. Add the lemon zest to the flour and mix it together with your fingers to release the lemon flavor; set aside.
In another large bowl whisk together the sugar, oil, milk, and orange juice. Stir in the flour a cup at a time until it is incorporated. Scrape down the sides of the bowl with a spatula after you add each cup and mix well.
Fold in the apple chunks.
Pour the batter into your prepared ring pan. Place the apple slices around the top of the batter. Sprinkle the turbinado sugar on top of the apple slices.
Bake in the middle of the oven for 35-45 minutes or until a skewer inserted into the cake comes out clean.