A Fennel bulb looks kind of like a cross between an onion and the base of a bunch of celery and has a sweet, aromatic, anise-like flavor without making your food taste like licorice.  
 
Fennel is native to the Mediterranean region and does best in dry soils near the ocean or on river banks. The strongly flavored leaves of fennel are similar in shape to dill. The bulb can be sautéed or grilled, or eaten raw. Fennel bulbs are used for garnishes or sometimes added to salads.
 
Sold in a 4-pack.