Though called pancakes, these are quite different creatures from the lemony, sugar-dusted French crêpes and the thick, fluffy American ones. This rice flour pancake is fragrant with coconut and coloured a glorious gold with turmeric. It is fried until crisp and deliciously greasy – which is why the Vietnamese like to tuck the pancakes into fresh lettuce leaves with lots of fresh herbs to lighten the snack. Banh xeo is usually filled with prawns and/or pork, beansprouts and spring onions, but you can play with this; I used chestnut mushrooms for this recipe. The pancake wedges with their vegetables and herbs make an extremely generous snack; but one of the best things about banh xeo is trying to stuff the whole package into your mouth at once without dripping nuoc cham.