Step 1: Preheat your oven to 325°F (160°C). Grease and line a 9×5 inch loaf pan with parchment paper.
Step 2: In a small bowl, combine the chopped dates and boiling water. Let them sit for 10 minutes, then mash slightly with a fork to form a chunky paste.
Step 3: In a medium bowl, whisk together the flour, baking powder, baking soda, ground cardamom, and salt.
Step 4: In a large mixing bowl, cream the softened butter and sugar together until light and fluffy, about 3-4 minutes.
Step 5: Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
Step 6: Gently fold in the date mixture (including any remaining liquid) into the wet ingredients.
Step 7: Gradually add the dry ingredients to the wet mixture, folding gently until just combined. Do not overmix.
Step 8: Fold in 3/4 of the chopped pistachios, reserving the rest for the topping.
Step 9: Pour the batter into the prepared loaf pan and smooth the top. Sprinkle the remaining pistachios over the surface.
Step 10: Bake for 45-55 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack.