The structure i suggest is:
a) Subject of the idea
b) Examples of what it can offer
c) Skills to be developed
d) New Structures
a)
- Being able to find Truffles
b)
- Characters can't find truffles because their hidden undergroud, only dogs/pigs can
- New Recipes (baking maybe?)
- There are hundreds of different Truffles species. There could be a few from the common to the more rare laying around the map in different seasons
- Truffles CAN'T BE planted
c)
- Truffle snifing (without it, your dog/pig can't locate the truffles)
- Truffle cooking (to cook new recipes with truffles, or involve this recipes with other skills)