1 tbsp golden syrup
1 tsp bicarbonate of soda
200g/7oz pitted dates
170g/6oz demerara sugar
55g/2oz dark muscovado sugar
200g/7oz self-raising flour, plus extra for flouring
2 tbsp black treacle
陆 tsp vanilla extract
55g/2oz butter, plus extra for greasing
55g/2oz butter, diced
110ml/4fl oz double cream
2 free-range eggs
vanilla ice cream, to serve