We recommend not mixing fresh meat to the kibble, but preferably feed the fresh meat separately. This way it will not contaminate the kibble if your pet does not eat the total contents in one sitting.
Often times starting with the fresh meat will trigger your pet to continue to start eating their dry kibble or will eat the dry food a little later when they realize the fresh meats are all gone.
Some pets may take a little time to get used to this but eventually get the idea.
When feeding raw meat and organs, scrutinize for parasites (tapeworm cysts) and take precautions against bacterial contamination.