Elder Trois complains about the food and displays a (yummy) maggot as an evidence if you just talk with him.

Well, not necessarily. You just need to make it look more delicious.

Aren't sausages fine food?

There is the Wurst-Things-Wurst machine.

You have to... you know... make it smaller and easier to wurstify.

Yup. Put the maggot into the blender.

Did you push the button? You have to push the button. I know, I know. Just.. please... push the button and get on with it.

Good job! Now put the ground maggot into the wurst machine and give the sausage to Trois.