My findings on crafting writ drop rates; "temper"=bervez juice/frost mirriam for provisioning, gold level mats for all others; "fragment"=psijic ambrisia fragment for provisioning, glass motif for all others : r/elderscrollsonline
Eat Your Games: Elder Scrolls Online's Jewels of Misrule - Sidequest
ESO Provisioning Guide: Food, Drinks and Fast Leveling - Fextralife
How To Craft Psijic Ambrosia In The Elder Scrolls Online - EIP Gaming