I give raw chicken, turkey and beef. I just give them pieces now and again (if I'm cooking with meat I wouldn't dare not give them a bit - I don't give them raw pork though). I also give raw chicken wings to Jaffa. If it's just a treat, you don't need to worry about adding anything. If it's making up more than about 10% of the diet then you need to think about making it a balanced meal by adding a supplement or making sure you feed organs, bones etc.