The couple then sampled their way through a number of the company’s drinks – and Kate even downed a shot of 120-proof whiskey reports People.
"Delicious!" she said.
When owner Joe Healey pulled out a bottle of rum however Wills reportedly started to panic.
"Rum?! This is where the engagement really goes downhill!" he joked.
"I'll fall over if I drink that!"
Earlier in the day the royal couple visited the Truro Cathedral as well as the Youth Centre Zebs where they chatted with locals and children from the centre.
Kate wore a soft pink dress by Lela Rose and her favourite nude wedges.