The Acmella Oleracea plant is known by many names — the toothache plant, the electric daisy, the eyeball plant and paracress.
If you nibble on one of buds of this plant, it creates a unique buzzing sensation in your mouth. Thus the buds are called “buzz buttons” or “szechuan buttons”.
The sensation is somewhat similar to the numbing and buzzing effect caused by biting into a Szechuan peppercorn. However, the buzz from the electric daisy is not as peppery — it is more effervescent and numbing.
The effect is caused by a naturally occurring alkaloid in the plant — spilanthol.
You can find fresh buzz buttons on Amazon. You can also find the seeds of the plant, if you wish to grow your own. This might be best, because even the fresh buds tend to be a bit wilty when they arrive.
If you do grow your own electric daises, you can add small the leaves to salads for the unique flavor and sensation.