In a small bowl combine flour, salt, pepper and cayenne pepper. Mix thoroughly. Dust prawns in flour mixture.
In a large frypan saute the floured prawns in olive oil for 5 minutes over high heat. Toss prawns often to prevent burning. Transfer prawns with a slotted spoon to a serving dish leaving the oil in the frypan.
In the same frypan saute the garlic, onion, parsley and oregano over medium heat for 3 minutes; stirring constantly.
Spoon the mixture over the prawns. Return frypan to the heat. Preheat your grill for medium heat.
Pour the wine and brandy into the frypan and ignite with a match or lighter. When the flames die down stir to loosen any browned bits on the bottom of the frypan; pour over prawns.
Place the serving dish of prawns in a preheated grill for about 2 minutes.