I thought the "Grandma's Pantry" was another wasted decorative item. Made at the same time as the canning station, yet split up and sold in a separate store set, this item was obviously intended to pretend to be a pantry containing all of your sim's canned foods.
So why didn't they allow it to function that way? Who knows.
Anyway, I added the treasure chest functionality from World Adventures to this one too. Now store as many of your canning station goodies in a place where they should go.
Additionally, as I'm on an anti-floral decoration kick, I added a new _IMG resource to remove the decoration.
This had to be done since the floral images were on the same layer as the content of the jars.