Preheat oven to 350. Lightly grease a 10 x 15 jelly roll pan.
In a small bowl, mix the persimmon pulp and the baking soda. Set aside.
Using a new small bowl, mix the beaten egg, sugar, coconut oil, vanilla and raisins.
Using a large bowl, add the flour, cinnamon, nutmeg, cloves and salt; stir to mix.
Give the persimmon mixture a quick stir and add to the flour mixture. Add the egg mixture to the flour mixture and stir to combine. Add walnuts if using, and stir again.
Pour batter into prepared pan and bake in preheated oven until gold brown and toothpick comes out clean. Allow bars to cool for 15-30 minutes before topping with glaze.
TO PREPARE THE LEMON GLAZE
Combine the confectioner's sugar with lemon juice & stir until sugar is dissolved. Spread glaze over slightly cooled bars.