Place garlic, coriander and mint in bowl and chop for 2 seconds on speed 6. Scrape down.
Add teriyaki sauce, sweet chilli sauce, lime juice and butter. Mix for 5 seconds on speed 5.
Pour over prawns in a bowl and allow to marinade for at 30 minutes.
Cook either on barbecue hotplate or in frying pan with the marinade for 3 to 5 minutes or until prawns are cooked through.
Serve immediately with extra lemon wedges if desired