As far as I know “burn” isn’t a scientific term, so it’s subjective. You wouldn’t say that someone burned a pizza if it had leopard spots on it if it’s pleasant to you.
In my opinion, the definition of “burned food” could be “heat related changes that i find unpleasant”. That absolutely happens with coffee.
Big difference between dark roast beans and burnt.
As far as I know “burn” isn’t a scientific term, so it’s subjective. You wouldn’t say that someone burned a pizza if it had leopard spots on it if it’s pleasant to you.
In my opinion, the definition of “burned food” could be “heat related changes that i find unpleasant”. That absolutely happens with coffee.