Step 1

Place the noodles in a heatproof bowl and cover with boiling water. Leave for about 10 minutes. Drain and set aside.

Step 2

Meanwhile, heat the oil in a frypan over medium-high heat. Add the prawns and cook for about 2 minutes on either side until cooked through. Remove from the pan and set aside.

Step 3

Cook beans in a saucepan of boiling salted water for 2-3 minutes until just tender. Drain, then refresh in cold water.

Step 4

Combine the sugar, lime juice, fish sauce and vinegar in a large bowl, stirring to dissolve the sugar. Add the noodles, prawns, beans and remaining ingredients to the bowl with the dressing. Toss to combine, then divide among bowls and serve immediately.