To cook the couscous
Remove the leaves and fibres from the corn cobs. Cook the couscous and corn cobs in boiling salted water for approx. 8 mins., rinse with cold water, drain. Empty the couscous into a bowl.
Brush the corn cobs and tomatoes with the oil, season with salt. With the lid down, grill the tomatoes in a grill tray along with the corn cobs and lemon halves over/on a medium heat (approx. 200°C) for approx. 15 mins. all over. Remove the vegetables from the grill.
Squeeze the juice from the grilled lemons, mix with the oil, rosemary and garlic in a bowl, season.
Remove the corn kernels from the cobs using a knife. Mix the dressing into the couscous, mix in the sweetcorn with the grilled tomatoes, cucumbers and herbs.