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Alternate prawns and tomatoes onto 8 skewers until all are filled. Lay the skewers in a shallow tray or baking dish. Mix the Fiery guava or sweet chilli dipping sauce with the lime juice and thyme leaves, then pour over the skewers. Leave in the fridge to marinate for 30 mins.
Place the prawns onto a baking tray and pop under a hot grill or over the barbecue for about 10 mins, turning and basting occasionally. Once cooked, serve with an extra pot of Fiery guava sauce for dipping.