It's embedded in a worldbuilding religions page (also worth a look), but this section in particular might help:

If they grow anything on the mountains above their homes, barley would make sense- it's the main crop in Tibet. It also give them somewhere to get those gallons and gallons of ale from, if you have Ye Old Drunkard Dwarves™.
Mountaintop yak and goat herders would make sense too, so that could give them dairy and meat.