Step 1: Preheat your oven to 180°C (350°F) and grease a 20cm square baking dish.
Step 2: In a bowl, combine the chopped dates, boiling water, and baking soda. Let it stand for 10 minutes to soften.
Step 3: In a separate large bowl, cream together the 75g of butter and 150g of brown sugar until light and fluffy.
Step 4: Beat in the eggs one at a time, followed by the finely chopped stem ginger.
Step 5: Sift together the flour, ground ginger, and baking powder. Fold this into the creamed mixture.
Step 6: Stir in the date mixture (including the soaking liquid) until just combined. The batter will be thin.
Step 7: Pour the batter into the prepared dish and bake for 35-40 minutes until a skewer comes out clean.
Step 8: While baking, make the sauce by heating the butter, brown sugar, and cream in a saucepan over medium heat. Boil for 2-3 minutes until thickened.
Step 9: Prick the warm pudding with a fork and pour over half the sauce. Serve the rest on the side.