This recipe is a simple no-churn variety, rippled with tangy rhubarb, then sandwiched between two crisp, custardy biscuits ... Add the flour and custard powder and mix to form a ball of dough.

Sprinkle over crushed ratafia biscuits and level gently with the back of a metal spoon. 4 Carefully pour over the custard. 5 Decorate with blobs of softly whipped cream and sprinkle with flaked ...