The quest appears to have been amended.
I've completed the earlier quest, Tudor's Beer by collecting the items, giving then giving them to NPC: Liviu.
He combined and gave me the drink for turn in. Just as people described here.
Great.
For this Tudor's Ale quest, the Worn Cask and Rawhide Canteen were looted. (i killed 'a potamide protector' ).
Barley and Hops were vendor bought from Liviu.
Attempting to turn in the 4 items to Livu, presented a red message:-
You must turn in all quest items at once in order to complete this quest.
Double checked, 4 items going in, the 4 from the quest and still it fails.
The 4 "gather" objectives are marked green, the active task in white is to "combine".
Then I've seen a key difference between this page information and the quest log in game!
Here it talks of turning in: Liviu's Finest Brew
The game asks for: Nicoli's Finest Brew
Having spotted that, I went looking for Nicoli.
That NPC is in the big tent, few steps north of Tudor and Liviu
Gave Nicoli the 4 quest items, and received the brew!
Gave that brew to Tudor and the quest completed.