Place pitted Medjool dates, almond butter, 1 Tbsp coconut oil, crushed cardamom seeds, and ¼ tsp. salt in the bowl of a food processor with blade attachment. Process on high until the mixture breaks down; it will appear mealy and sticky. If it appears dry, add 1 more Tbsp. of coconut oil. Process again.
Line 8x8-in baking pan with parchment paper. Transfer mixture into pan and spread in an even layer with a spatula. Adorn with ¼ tsp. salt, flaked almonds and ground pistachios. Smooth with an offset spatula to create an even layer. Some oil may separate, but it will settle in the freezer.
Freeze for minimum 30 mins.
Remove from baking pan and cut into squares. Sprinkle with ground pistachios.