With all due respect, the word "steak" is a concept - it doesn't relate to any physical part of the animal's body that it's from. There's no part of a "steak" or "sausage" in an animals' anatomy - if you want things to be accurate, call things after the part of the animal's body it comes from.
Steak is but a concept of the shape of something - as is a burger, sausage, etc. The material doesn't matter. An aubergine steak is just as much a steak as a beefsteak - there's no steak in a cow's body, and there's no steak within an aubergine XD
If anything, the terms "steak", "ham", "burger" etc are euphemisms