There isn’t very much methanol produced in large distilleries. However, when distilling the beer to make whisky (for example), the liquid goes through a still. This evaporates off the alcohol, and condenses it, collecting the higher-proof liquid. The methanol evaporates off first. So, distilleries will run off the initial part of the liquid that condenses and not collect it, only beginning collection once things settle. This part that gets discarded is called the foreshot.
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