Make the batter
Preheat the oven to gas 4, 180°C, fan 160°C. In a large mixing bowl, use a wooden spoon or electric mixer to combine 100g of softened unsalted butter and 140g Demerara sugar until light and fluffy. (The mixture will be a little grainy, because of the coarse sugar.)
Mix in 2 beaten eggs, 200g self-raising flour, 1 tsp bicarbonate of soda and the date paste. Stir until well combined. Then mix in 110ml whole milk.