I made this Phantasmal Haunch farming guide to help out players who want to farm meat instead of buying them from the Auction House. I traveled around the Shadowlands to search for places with a high density of mobs that drop Phantasmal Haunch. Below you will find a list of places I think are the best for farming Phantasmal Haunch.
One mob can't drop more than one meat, and the drop rate of Phantasmal Haunch and other Shadowlands cooking ingredients are a lot lower than the BfA cooking materials drop rate was. Don't expect getting as much meat as in BfA!
The best way to get a lot of Phantasmal Haunch is farming Gorm Raveners at Northwest of Glitterfal Basin. They respawn extremely fast, and you can always pull at least 3 of them together. They hardly do any damage and they have low armor.