Doughnuts with vanilla cream and strawberry and lime purée

By Anna Haugh From Saturday Kitchen Ingredients For the doughnuts 125g/4½oz plain flour, plus extra for dusting 1 tsp baking powder 20g/¾oz caster sugar, plus 100g/3½oz for rolling large pinch salt 1 free-range egg, beaten 1 vanilla pod, split and seeds scraped …