The secret is honey! It makes the chicken tender and juicy, according to a cooking show I watched today. Also, dipping the chicken in egg before battering helps the batter stick to the chicken.
(apologies to any vegetarians reading this)
I haven't run across frozen chicken in my local supermarkets (5). Campbell's chicken soup and chicken broth seems to have disappeared from Kaldi also. They only have cream of chicken soup. They did start carrying risotto too. Has anyone ever used ghee? They carry it! Apparently it adds richness to curry.