There are quite a few recipes that are not consumable in the mists/pvp lobby.
For example the Recipe: Major Sigil of the Night [&AgHijAAA] can’t be learned while on that map, but a majority of the rest of the recipes in the game can.
There are a bunch of recipes like this. Mostly armor sets like the Zealots recipes. Most everything else you can learn wherever you want.
You don’t win friends with Salad.