Preheat Oven & Prep Pan: Set your oven to 180ºC (350ºF). Prepare a 9-inch x 5-inch rectangle baking pan by lining it with parchment paper. For non-stick pans, grease with soft butter, line only the base with parchment, and dust the sides with a light layer of flour for smooth cake edges. Set aside.
Steep Tea: Pour boiling water into a large heatproof jug, add tea bags, and steep for 10 minutes.
Prepare Dates: While the tea steeps, pulse dates in a high-speed food processor until they are chopped into small chunks. Alternatively, chop the dates manually with a sharp knife.
Soak Dates: Transfer the chopped dates to a large mixing bowl. Once the tea is ready, pour it over the dates, ensuring they are well covered, and allow to soak for 10 minutes.
Combine Wet Ingredients: To the soaked dates, add sugar and whisk until well combined. Then, whisk through the egg until fully incorporated.
Mix Dry Ingredients: Sift flour, baking powder and baking soda directly into the wet mixture. Use a silicone spatula to gently fold the ingredients until just combined, ensuring there are no large pockets of flour.
Bake: Pour the batter into the prepared baking pan, smoothing out the top. Bake for 40-43 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
Cool: Remove from the oven and let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve: Enjoy the cake warm or cold with a spread of butter!