The thinly sliced tongue cooks very fast but this you can afford to go lower on the flame(and cook at the side) to achieve a super satisfying and less chewy bite. Though there's no way u can slow cook it until it's tender. Highly recommended if you know what you're doing and you enjoy tongue

P.S. what I do is quickly sear both sides on high flame to get some colour, before "slow" cooking them at the side at low heat