The "Chewy Meat Bar" is a mission you get from The Duke . You get this mission right after finishing the Culinary School mission. This is the 1st mission from a series of 5 missions from the Baby Duke Bar Quest.
You must obtain level 14 before receiving this quest
"I had a glorious dream last night in which we devised the supreme snack, the Baby Duke Bar! We must make it real!"
Harvest 20 Grapes - the Baby Duke Bar's secret ingredient!
Have 5 Mystery Meat to form the Baby Duke Bar's meaty center
For completing this mission you will get 1750 Coins and 35 XP. You would also be able to start the Coat of Honey mission.