

Mix the soy sauce with the sugar and a pinch of ground pepper and pour it over the chicken pieces.
Blend the coriander roots, peppercorns,ginger and garlic and some salt in a food processor to a coarse ground paste. Toss the marinated chicken in this mixture.
Thread the chicken onto the skewers and grill until golden brown, about 5-6 minutes. Keep warm tightly wrapped in foil in a low oven. Serve with the dipping sauce below.
Recipe for Dipping Sauce
Whizz the chillies, garlic and coriander root with the salt and sugar in a food processor until smooth. Add the vinegar to taste (about 2 tbsp) - the flavour should be sour, salty and sweet. If it's very acidic then dilute it with a little water. This will also make it easier to pour.
A nice touch would be to give everyone their own little bowl of sauce - then double dipping won't be an issue.