Sumac-roasted strawberries with yoghurt cream

This is a good pudding to remember if you have over-ripe strawberries which are slightly past their best. Roasting them makes them deliciously soft and sticky. All of the elements can be made 3 days in advance – keep them separate in the fridge and assemble when ready to serve. Serve this as it is, for a light summer dessert, or with shortbread biscuits. Thanks to Helen Graham.