Purple sprouting broccoli tempura with nuoc cham

For the nuoc cham, whisk together all of the ingredients with 5 tbsp hot water in a small bowl. Set aside while you make the tempura.

Whisk the cornflour, plain flour, sesame seeds (if using) and a large pinch of salt together. Fill a large, deep pan no more than a third full with the vegetable oil and heat until it reaches 180C or a cube of bread dropped in browns in 20 seconds.