WHISK together the tomato sauce, VEGEMITE and Tabasco. Set aside half the mixture and marinate the prawns in the remaining mixture for 5-10 minutes.
LIFT the prawns from the marinade then discard. Char grill the prawns for 2-3 minutes on each side or until cooked.
SPOON the coleslaw onto the rolls then top with the prawns and a drizzle of the remaining sauce. Serve immediately.