Both Cooking Fat and Broth are tier 2 ingredients
You can get them In second zone -most likely from first barrels you open. If you dont get them -level provisioning a bit (at least to 20)
there is also a grocery vendor that sell some provisioning mats selling some various fats/lards - grains/malts - broths, as example ebonheart pack there is a vendor in davons watch in stonefall . i had no problems or issues finding mats to level it up at all so for your faction go to primary start zone city and look for grocery vendor
so far I've found the key to finding areas to loot these items is based on the level of the item your crafting. as an example...when looking for liver and sweetmeats (to craft with my lvl 15 recipes), I went to northern Auridon (dominion). the quests/mobs in this area are around 13-15...and I was finding sweetmeats and liver. ironically, in the port of haven in grahtwood (15+ area), I found none...after multiple trips through. one trip through the ruined town of greenwater cove and i found about a dozen of each.
So if your still stumped. find the level of the item your crafting, and find a reasonable sized town around that level, and loot away.