Generously spray a 9 inch tart pan with non stick cooking spray or grease with the oil of your choosing. Since the mixture contains dates, you want to make sure your pan is well coated in order to ensure you can easily remove your tart from the pan once chilled.
Wash and dry the bowl of your food processor since we will be using it to create the mousse.
In the bowl of your food processor, place the avocado, maple syrup, cocoa powder and the melted chocolate, salt and coconut cream mixture.
Pulse a few times to get the mousse going then let the food processor run for about 30 seconds or until the mixture is completely smooth.
Coconut cream can be found in the health food section of most grocery stores. I like to buy my coconut cream from Farm Boy or Whole Foods. If you are unable to find a can of coconut cream, I recommend buying 3 cans of full-fat coconut milk and placing them in the fridge the night before you plan on making your tart. Two cans should be enough for a ½ cup of coconut cream, but I recommend buying 3 just in case. When you will be ready to make your mousse, open the can and remove only the thick white part which should be right at the top of your can. When you chill a can of coconut milk, the cream will float to the top and solidify where as the water will stay liquid and go to the bottom of the can. Chilling your can will make it easier for you to scoop out the cream without any of the water. You can either discard the water or use it in your smoothies which is what I like to do.