The aim is to find spices for specific recepies. The original idea was to share rare spices in a building, to check which one of your neightbours has it so you don't have to buy it. For now, the Location is within your own kitchen, for the sake of clarity (for me:).
Classes: Spice, Recepie, Location
A spice can be used for various recepies.
One spice can only be at one location. (Ideally, if you share.)
A recepie needs one or more rare spices.
Locations can have more spices. (Could, but not yet.)
Interaction: A spice can be added to recepies. A spice can be found at one location?!