be careful u dont cook them....its not pretty. im talking adult rats here but i just leave them defrost a few hours/all day so their soft all the way through. Then i warm them on the radiator with newspaper under neath them only to take the chill off them, not so they are warm through. Then i dip the head in almost boiling water for a few seconds, take it out and leave it cool a couple of seconds so theres no scalding water and offer it like that!
e2a i only leave em on rad for about 20 mins, turning halfway and these are 300g rats!! also they are NOT directly on the rad. with a 10g rat i would give em maybe 30 seconds a side( give the newspaper 10 mins to get up to temp before u put em on there if u do decide to go down this route)