I'll help you out with this one cause I remember doing it recently myself. If you read what the NPC asked you to do overall, it is to replace the soup stock which was tainted and to do so you would need a Foulbelly Meatball. After making the Foulbelly Meatball, you continue another synthesis with the meatball and the additional NPC ingredient which was given to you during the instance to make the soup stock. The journal should update at this point and you can continue to finish the quest. But you are correct in saying there is no journal update after the creation of the meatball saying you should now make the soup. SE seems to have forgotten this step in the process and it causes a bit of confusion on what to do next. Enjoy the ending, it's at least more memorable compared to some of the other class quests.