1 medium orange, zest and juice
1kg/2lb 4oz ripe plums, halved and stoned (if desired although not essential)
200g/7oz jumbo rolled oats
50g/1¾oz golden caster sugar
½ tsp ground cinnamon
2 tbsp runny honey
pinch salt
2 star anise
2 tsp oil (such as sunflower, corn, rapeseed or light olive oil)