Pour the boiling broth over the couscous, stir once and leave to soak for 5 minutes.
In the meantime, quarter the cherry tomatoes, cut the spring onions into slices, finely dice the onion, finely chop the parsley and cut the mint into fine strips.
Fluff the couscous with a spoon and stir in the vegetables. Add the lime juice and oil and season the salad with salt and pepper.