What do I do if I forgot to remove the first 50ml?

Dilute and redistil. Do not consume it.

If you have forgotten to remove the first 50ml and you're using a still that requires you do so, the best way forward is to;

• Stop the run, allow to cool re-add to the wash and start the run again.

Or

• Continue the run then dilute your alcohol down to between 15 – 20% ABV, and redistil through the system and make sure you discard the first 50ml this time.