Place the dates and water in a small saucepan over high heat, uncovered. When the water boils reduce the heat to medium, and cook till the dates are completely broken down and paste-like, stirring occasionally (about 10 minutes). Let cool till warm.
In a large bowl combine the oats, cocoa powder, pistachios and cherries. Stir in the date paste and almond butter till well combined. Using slightly dampened hands, press into your prepared pan.
Freeze for 2 hours, or overnight. Using your parchment sling to assist, transfer to a cutting board and cut into bars.
Store bars in an airtight container in the fridge.
Notes
Use any combination of nuts and dried fruits that you like - chop up larger pieces.
Swap the almond butter for peanut butter, sunflower seed butter or even tahini!