Cut some big slices into the chicken, about three quarters of the way through and place in a single layer in a dish.
Make the marinade by grating the ginger and crushing the garlic. Mix with the remaining ingredients and pour over the chicken. Use a spoon to work the marinade into all the cuts on the chicken.
Cover the chicken and refrigerate for at least 30 minutes, but preferably 2 hours up to a maximum of 8 hours.
Slice the chillies and spring onions at an angle and rough chop the coriander. Quarter the lime.
Set the grill to a medium heat and allow about 6 minutes each side, basting with the marinade.
Sprinkle over the garnishes and serve with wedges of lime.
Notes
Pro tips:
I find it's easier to freeze ginger to stop it spoiling before I use it all. I cut each piece into chunks, about 3cm in length, then put them in the freezer. When I need ginger it normally needs to be chopped or grated so I just use a microplane grater without bothering to peel it either. It's much easier to grate when it's frozen and doesn't clog up the grater.
Limes can be difficult to juice so it helps to roll them on a worktop then microwave them on high for 20 seconds before juicing.
Lime zest can give a great lime flavour but be careful to just remove the green skin as the pith underneath can be very bitter.