To blender or food processor, transfer dates and soaking water. Process until smooth. Add spelt flour, 3 Tbsp maple syrup, 1 tsp vanilla, cinnamon, cloves, baking powder, and salt. Process until well mixed. Add melted and cooled butter and eggs. Process until well mixed. Into prepared cake pan, pour batter. Bake cake until it’s golden brown and springs back when you press it in the center, about 25 minutes. Let cool for 5 minutes before removing from pan and slicing.