Step 1: Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan, or line it with parchment paper for easy removal.
Step 2: In a medium bowl, whisk together the flour, baking powder, baking soda, ground cardamom, and salt until well combined.
Step 3: In a large mixing bowl, cream the softened butter and brown sugar together until the mixture is light and fluffy.
Step 4: Beat in the eggs one at a time, then stir in the vanilla extract, orange zest, and orange juice.
Step 5: Gradually add the dry flour mixture to the wet ingredients, stirring just until combined. Be careful not to over-mix.
Step 6: Gently fold in the chopped Medjool dates and the walnuts until evenly distributed throughout the batter.
Step 7: Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Step 8: Bake for 50 to 60 minutes, or until a toothpick inserted into the center of the loaf comes out clean.
Step 9: Allow the loaf to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
Step 10: Slice and serve the citrus cardamom date loaf with walnuts with butter or enjoy it plain.