Preheat the oven to 450ºF. Place an 8- to 10-inch cast iron skillet in the oven while it heats.
In a blender, combine the eggs, coconut milk, almond flour, arrowroot flour, lemon zest, vanilla, cinnamon, and salt. Blend until smooth.
Remove the hot skillet from the oven. Add the coconut oil and swirl to coat the surface of the pan. Slowly pour in the batter. Scatter the berries over the top and return to the oven. Bake for 15-18 minutes, until puffed and golden.
Slice and serve drizzled with honey or maple syrup.