can i ask 1 question why do you want to roast it?
best bet is making a nice stew with the rabbit.
1 large cooking pot with lid
take 1 rabbit cleaned an jointed
peel and slice 2-4 carrots depends if you like lots off veg or making for a few peeps
peel an dice 4 spuds or how many you think you will need when cooking for 2 i use 4 largish spuds
peel an roughly chop 1 large onion
place all in the large pan with the jointed rabbit an cover with water an place on a medium heat till it boils then let it simmer for 2-3 hours if you in no rush,
or if you have a slow cooker place all off it in