Double-decker Vowelburgers™ -- 5 are meat, 1 is vegan

^{Inspired by Avi’s Vowelburger™ Riddle}
After making burgers with five and six layers, Vowelburgers™ has noticed that the customers have not been hungry enough to eat such massive burgers. We are therefore introducing Double-decker burgers so you can get layered burgers in smaller portions. Five of the new burgers are exotic meats, but one is just vegetables. A Double-decker Vowelburger™ means three consonant buns sandwiching two vowel patties as shown:

Here are the menu descriptions of the six new burgers:

Can you identify each of these burgers from their descriptions? Which is the vegan one?

Notes:

• Each burger consists of a layer 1 and a layer 2 (in that order).

• Eating the Double-decker Vowelburger™ is like eating 2 regular Vowelburgers™ merged with each other; in other words, the top of the first layer is the bottom of the second layer.

• Both layers are regular Vowelburgers™ on their own.

Enjoy!