Photograph: Keiko Oihawa
For the dip:
- finely grated zest of 1 large lime
- 500 g (minus 4 tbsp – see below) natural Greek yogurt
- 1 large handful of mint leaves
- 1 tsp nigella seeds
For the marinade:
- 4 tbsp natural Greek yogurt
- 1 tbsp peeled finely chopped root ginger
- 1 tsp paprika
- 2 tsp garam masala
- juice of 1 large lime
For the skewers:
- 30 raw peeled jumbo king prawns
- 3 tbsp sunflower oil
- 1 cucumber, peeled and cut into short batons
- lime cheeks
- mint leaves
For the dip, whiz together the lime zest, yogurt and mint leaves in a food processor until the mint is finely chopped. Add 1 tablespoon of cold water, season to taste and whiz again briefly. Tip into a serving bowl, cover and chill.
For the marinade, mix together the 4 tablespoons of Greek yogurt with the ginger, paprika, garam masala and lime juice; season.
Prepare your prawns by making a small incision down the length of each prawn; if necessary, pull away and discard the black digestive cord. Rinse the prawns and pat dry. Thread on to skewers. Transfer to a shallow dish and coat thoroughly in the marinade. Cover and chill for 30 minutes.
Place a small frying pan over a medium heat. Add the nigella seeds and toast lightly for 1 minute or until they release a lovely smell. Sprinkle over the dip.
Preheat a griddle pan or grill to high. Wipe off the excess marinade from the prawn brochettes and brush with the oil. Place on the griddle pan or under the grill for 4-6 minutes, turning, until they are pink and cooked through. Arrange with the cucumber batons and lime cheeks on a platter. Scatter with mint leaves and serve with the bowl of dip.
Kitchen secret: soak wooden skewers in cold water for 30 minutes before using.