1. Place all the ingredients in a bowl with the butter and mix until all the chilli, garlic, shallots, coriander and spices are spread evenly. Keep the butter out of the fridge so it is easy to spread on to the langoustine.
2. Lay the langoustine on a flat surface on their belly and using a sharp pair of kitchen scissors cut down the middle from the head end to the tail.
3. Turn the grill on to maximum while you prepare the langoustine. Take some butter and coat the flesh of the langoustine. Place under the grill and cook for 3-4 minutes. Meanwhile cut two limes in half then place in a hot pan cut side down and cook until charred.
4. Arrange the langoustine on a plate and squeeze over some of the lime and tuck in.

Enjoy!