veggie burger

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A patty made from nonmeat products, especially legumes, other vegetables, and grains.
• noun A sandwich consisting of such a patty usually in a roll or bun.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A burger containing a patty made without meat or other animal products.
• noun A burger patty made without meat or other animal products.