By not initially running the distillation at a temp that allows the heads or methanol and fusels to boil off first, come down dripping from the cooled condensing coils of copper, and be discarded. If you touch a drop of that first product dripping to your tongue, you can taste the unique bitter methanol.
Then you keep what comes next, the “hearts” of the run batch. Tails are last, after moat og the ethanol is extracted
Thanks for the explanations. It sounds like the distillation columns in refineries where different weights of product are drawn off from the column at different elevations.