We have seen more variety added to similar crops in the game recently so I thought I would suggest even more to the abundance.
White wine production alongside red wine.
Different FEP profiles between red and white wine.
Expanded cooking recipes using grape variety as an ingredient distinction.
Red grapes → Red wine
Green grapes → White wine
Certain recipes could specifically require one or the other, or give different results depending on the type used.
Also, potatoes please.