Whole Rump Barbecued

Put meat into a large glass dish. Combine all remaining ingredients.
Pour over meat, cover with plastic wrap and leave in fridge 24 hours.
Drain meat and reserve marinade.
Sear all sides of meat on barbecue, then turn heat down low and cover cook for 2 hours. (This can be done in the oven if necessary).
Baste with reserved marinade every so often.
Rest meat 15 minutes before serving.