Preheat oven to 350 degrees Fahrenheit. Line the bottom of a 7 inch springform pan with parchment paper.
In a bowl, cream together honey and coconut oil. Whisk in the 3 large eggs. Add to the mixture, coconut milk, coco powder, vanilla, cream of tartar, baking soda and salt. Mix in the 1 cup of Hazelnut flour. Mix until smooth.
Pour the mixture into the parchment paper lined springform pan.
Bake at 350 degrees Fahrenheit for 25 to 30 minutes. The cake is done when a toothpick is inserted and comes out with moist crumbs. You want a dense cake when finished so the toothpick should come out clean. Let the cake set for at least 5 hours before removing from spring form pan & putting on plate with parchment paper underneath and cutting and serving. Keep refrigerated.