1 quantity Barney's roasted rhubarb (see recipe, below method) 250g pack butter, softened, plus extra for greasing 150g pot ready-made custard (not the chilled kind; I used Ambrosia) 250g self-raising flour ½ tsp baking powder 4 large eggs 1 tsp vanilla extract 250g golden caster sugar icing sugar, for dusting Want to see what this recipe costs at different supermarkets?