What's that message about nourishment on the Bulletin Board?
There is a shop that had something to do with nourishment all through the ages.
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Dry goods in the 1600s, fish in the 50s, fruit and veg in the present.
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You will see this message after you've unlocked all three locks of the cellar door in the Fruit and Veg Shop.
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If you don't know what you achieved by unlocking all three locks, this message must have given you a hint.
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Locate the entrance to the Gordon Lair, if you haven't done so already. You'll find you've unlocked it remotely, by unlocking the cellar door of the Fruit and Veg Shop, and all its previous incarnations.