Preheat the oven to 350°F. Line three 6-inch cake pans with parchment paper.
Bring ¾ cup of water to a boil, and steep 1 chamomile tea bag for 15 minutes.
Measure out ¼ cup of the hot brewed tea and set aside. (Feel free to sip on the rest while you bake).
In a medium bowl, empty the contents of the 2 remaining chamomile tea bags. Add the cake flour, baking powder, and sea salt and whisk together. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, cream the coconut oil, cane sugar, and vanilla extract. Add the coconut milk, canola oil, and ¼ cup of hot tea and mix on low until combined.
With the mixer on low, slowly add the flour to the sugar mixture. Continue to mix on low until incorporated, scraping down the sides of the bowl as needed. Divide batter evenly into each cake pan.
Bake for 30 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 shortening, powdered sugar, water, and lemon flavor. Mix on low until combined and then speed mixer up to high for 1 to 3 minutes or until light and fluffy. Add in the yellow dye and mix again, scrape down the sides of the bowl and mix to combine the dye completely. Transfer to a piping bag with Ateco tip #846.
To assemble the cake: Starting at the outside of the cake, pipe a circle of frosting and spiral into the middle of the cake. Place the second cake layer on top and repeat that process. Then top with the third layer. Pipe roses on top of the cake, starting around the outside of the cake in a circle and then fill in the middle with one rose.
Store a cake dome for up to 3 days.