Teriyaki Prawns

1kg fresh green prawns in their shells
bamboo skewers, soaked in water for 30 mins
1/2 cup soy sauce
2 tbsp brown sugar
1/2 tsp ground ginger
2 tbsp wine vinegar
1 clove garlic, crushed
2 tbsp tomato sauce

1. Make marinade by mixing all ingredients bar prawns and leaving for 1 hour
2. Shell prawns, leaving tails intact. Place in a non metal dish and smother with marinade. Cover and refrigerate 1 hour. Thread onto skewers.
3. Heat the BBQ and place a square of baking paper on the grill bars. Place prawns on the grill, brushing with marinade on both sides as they cook