To make cashew whipped cream drain and rinse cashews. In a high-speed blender combine cashews with water, coconut oil, agave, and vanilla and puree until completely smooth. Transfer to air tight container and place in refrigerator to set up.
Combine ingredients for walnut crumble in a food processor and pulse until combined. The crumble should stick together when pressed.
To assemble the parfaits place a little walnut crumble at the bottom of each parfait glass. Top with chocolate mousse, cherries, and cashew whipped cream. Repeat.Finish with a cherry and serve!