Ingredients
750g (1lb 10oz) plums, halved, stones removed
2 balls of stem ginger, roughly chopped, plus 2 tbsp of syrup from the jar
¼ tsp ground cinnamon
150g (5½oz) butter, plus a knob extra
175g (6oz) demerara sugar
100g (3½oz) porridge oats
125g (4½oz) self-raising flour
2 tbsp golden syrup
5 tbsp double cream