How do I get my BP to eat frozen/thawed???

My baby Rubi was about 2ish when I got him to eat F/T. I follow the directions on the food, which say to thaw the rat/mouse in a bowl of hot water. I usually have to change the water once and repeat. For me the key is to hold the thawed mouse under hot water so it's nice & hot. Then I use hemostats to dangle it in front of my baby. I make sure he's paying attention and wiggle it a little. He has a really good appetite though so maybe I am just lucky.