Rice Flour dusting for taste?

I have been experimenting with Rice Flour (RF) dusting for added taste. I am trying to replicate the taste of a loaf that I buy locally . The top of the loaf is burnt black and has a beautiful taste.

I can produce the cracked Black surface but not the taste. I have searched this forum and read where Tiger bread topping is produced by mixing RF with Sesame oil which results in the cracked surface and also the taste. This is not the taste i am searching for.

Any help/tips would be gratefully appreciated.

Eddie.