Bring a pan of water to the boil then add the tiger prawns and a tea spoon of salt to the water
Cook the prawns for 3-4 minutes and then strain the water and put the prawns straight into a bowl of ice-cold water
Once the prawns have cooled down, remove the shells
Meanwhile, peel the carrot, mango and cucumber then use a julienne peeler to make julienne carrot, mango and cucumber
Use a sharp knife and cut the iceberg lettuce julienne like the other vegetables
To make the dressing, chop the garlic, chilli and lemongrass (only the white part) very finely
Whisk the sugar with the water and fish sauce until the sugar is dissolved, then add the juice of 2 limes, the chopped garlic, chilli and lemongrass to the dressing and stir to combine all the flavours together
Use a big mixing bowl and mix the mango, carrot, cucumber, lettuce and prawns with the dressing then transfer to a serving dish or bowl
Garnish with coriander, mint and roasted peanuts and enjoy the salad.