Preheat oven to 350 degrees F and grease six 8”x8” cake pans with coconut oil.

In large bowl, combine almond milk and apple cider vinegar. Set aside.

In medium bowl, whisk together flour, sugar, baking soda and salt.

In almond milk-vinegar mixture, whisk in water, coconut oil, lemon juice and vanilla. Add flour mixture and whisk until smooth.

Into six bowls, divide batter evenly and add appropriate coloring ingredient(s) to make each a different color of the rainbow. Mix well until desired strength of color is achieved. Pour one color into each baking dish.

Bake 20 to 25 minutes, until toothpick inserted comes out clean. Allow to cool completely.

On plate, begin stacking cooled cakes by color order (first purple, then blue, green, yellow, orange and red), spreading frosting between each layer. Once all layers are in place, frost over and around entire cake.