Sharp fruit, a sweet topping and thick vanilla custard make Gregg's nan's crumble an irresistible pudding
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Thick vanilla custard
Heat 600ml double cream until steaming but not boiling. Meanwhile, mix together 6 egg yolks, 4 tbsp caster sugar, 2 tsp cornflour and ½ tsp vanilla extract in a bowl. Pour the cream onto the eggs, stirring continuously as you pour. Pour the whole lot back into the saucepan the cream came from and place over a medium heat. Stir until it thickens, about 10 mins, then pass through a sieve and serve.