Preheat the oven to 350°F. Line three 6-inch cake pans with parchment paper.
To make the batter: In a bowl add the flour, cinnamon, baking powder, sea salt and whisk together.
In either a mixing bowl with a whisk, using a hand mixer, or in a stand mixer fitted with the paddle attachment, add the carrots, apple, canola oil, cane sugar, honey, and eggs. Then add the flour mixture on top. Mix on low or stir with a spatula until the mixture comes together into a cake batter.
Measure batter evenly into each pan, about 272 grams each. Bake for 20 minutes or until a wooden pick inserted in center comes out clean. Allow to cool completely in the cake pans.
To make the frosting: In the bowl of a stand mixer fitted with the paddle attachment, add the butter, powdered sugar, honey, and vanilla extract. Mix on low until all ingredients are combined, then speed mixer up to high for 2 to 3 minutes or until light and fluffy. Scrape sides and mix again on high. Once the frosting is made, put at least half into a piping bag with Ateco tip #827.
On your cake round, spinner or stand, place the first layer of cake. Next, spread a good amount of frosting in the center of the cake. Then, go around the outer edge with the piping bag and tip to create a pretty side view. Top with the second layer of cake and repeat this process until the last layer is on.