Add the pistachios and oats to a food processor (preferred), or high-speed blender. Pulse together for 30-60 seconds to chop them up. It doesn't need to be a fine mixture, you'll still want some texture
Add the pitted medjool dates to the blender with the water, cinnamon, vanilla and a pinch of salt. Blend together to form a sticky dough.
Line a 9 x 9 pan with parchment paper and press the mix into the pan. Flatten down using your hands.
Freeze the bars for at least an hour to harden. Once they're firm, use a large knife to slice them into 18 bars by slicing horizontally twice creating 3 equal sections, then cutting 5 times vertically.
Melt the chocolate chips with the coconut oil in 30 second increments in the microwave until smooth.
Spoon some of the chocolate onto each bar, then alternate your toppings with crushed pistachios, crushed freeze-dried strawberries and sesame seeds.
Set in the fridge to harden. Keep refrigerated for up to 1 month, or freeze for up to 3 months.