Whisk all the dressing ingredients together until the sugar has dissolved OR place the dressing ingredients into a jar, seal with the lid and shake until the sugar has dissolved.
Place the rice noodles into a large dish and cover with boiling water. Leave to sit for 5 minutes then drain.
Toss the noodles, courgetti, bell pepper and chilli together with the dressing. Top with the coriander, spring onion and radish.