Nước sấu (sấu fruit drink)
When Hanoi's tamarind-like sấu trees drop their small green fruit in May and June, street vendors start selling glasses of nước sấu: a few candied fruits, a ladle of ginger syrup, cold water and crushed ice. Families make big jars to last until the season ends in August. It is sipped with a spoon so you can bite into the crunchy-soft fruit at the bottom. It tastes sour and sweet at once, with a clean ginger warmth and a flavour a little like green mango and plum. Traditional cooks soak the peeled fruit in limewater to keep it crisp; a salt soak works well at home. The common mistake is skipping the blanch and slow syrup: raw fruit stays acrid and the syrup clouds. Blanch the fruit briefly, then cook it gently in sugar until it turns translucent yellow-green and the syrup is clear and glossy. Store it in a sterilised jar in the fridge for up to 2 months with a clean spoon; discard if it fizzes, smells fermented or shows mould. Fresh sấu is rare abroad; look for frozen sấu in Vietnamese shops, or use firm green ambarella. Chef's tip: slash each fruit a few times so the syrup soaks all the way in.
























