That's the mash tun, you need to steep the grain at a relatively constant temperature for a while to release all the goodies, that's what makes your wort which is the thick yummy malty stuff you get in kits.
@snottyotter started
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That's the mash tun, you need to steep the grain at a relatively constant temperature for a while to release all the goodies, that's what makes your wort which is the thick yummy malty stuff you get in kits.